Packet no. 16
I am the smallest number written with two digits. Which number am I?
Show the answer
Answer: ten (10)
Digits are the signs from 0 to 9. We build every number from them, the way we build words from letters.
Brain teasers for kids: logic and maths puzzles
Brain teasers need a little maths or logic. Grab paper and a pencil, draw and try, and let the hints guide you step by step.
Collected0 of 87 stickers
Name: Date:
Clap once for each part of the word BA-NA-NA. How many claps is that?
Answer:
Clap once for each part of the word PEN-CIL. How many claps is that?
Answer:
Which letter is missing in the word C _ T?
Answer:
When you mix yellow and blue paint, you get the colour of grass. Which colour is it?
Answer:
When you mix red and yellow paint, you get the colour of a tangerine. Which colour is it?
Answer:
Answers (turn the page round) 1. three claps (3) · 2. two claps (2) · 3. the letter A · 4. green · 5. orange
Name: Date:
I am the smallest number written with two digits. Which number am I?
Answer:
I am an even number standing exactly halfway between six and ten. Which number am I?
Answer:
Three birds sit on a branch. Two fly away, and then one more lands. How many birds are on the branch now?
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I am an odd number between six and ten, but I am not seven. Which number am I?
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What is half of ten?
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How many legs do five birds have altogether?
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How many corners do two triangles have altogether?
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Add eight to me and you get fifteen. Which number am I?
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Change the first letter of NEW to D and you get the tiny drops you find on the grass in the morning. Which word is it?
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Read the word STAR backwards. What do you get?
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How many syllables are there in the word BUTTERFLY?
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One word does not belong: blue, red, green, chair. Which one?
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How many baby teeth does a child have before they start falling out?
Answer:
How many fingers and toes do you have altogether?
Answer:
How many different notes are in the scale: do, re, mi, fa, so, la, ti?
Answer:
Answers (turn the page round) 1. ten (10) · 2. eight (8) · 3. two (2) · 4. nine (9) · 5. five (5) · 6. ten (10) · 7. six (6) · 8. seven (7) · 9. dew · 10. rats · 11. three (3) · 12. chair · 13. twenty (20) · 14. twenty (20) · 15. seven (7)
Name: Date:
Multiply me by any number and you get me again. Which number am I?
Answer:
A tray of pie is cut into eight equal pieces. The family eats half. How many pieces were eaten?
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I am three fours, and I am also two sixes. Which number am I?
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I have three digits. The hundreds digit is 7, the tens digit is 0 and the ones digit is 5. Which number am I?
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Double a number and add three. You get eleven. What was the number?
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What is a quarter of twenty?
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Multiply me by myself and you get forty-nine. Which number am I?
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Which number comes next: 3, 6, 9, 12 ...?
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There are twenty-four children in a class. They split into groups of six. How many groups are there?
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Each side of a square is five squares long on grid paper. How many squares long is the whole edge around it?
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Rearrange the letters of LISTEN to get a word that means making no sound at all. Which word is it?
Answer:
One word does not belong: apple, pear, carrot, plum. Which one?
Answer:
Rearrange the letters of TEA to get something you do at dinner. What is it?
Answer:
How many words are in the sentence: The little rabbit hops away?
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Which word is left when you take the first letter off SWING?
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Which word has more vowels: KAYAK or AUDIO?
Answer:
In the food chain grass, rabbit, fox, which one is the meat eater?
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A grown-up has two hundred and six of us, and a baby has even more. We are hard and white. What are we?
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A painter mixes red and white. Which light colour do they get?
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Two teams play on a basketball court. If there are ten players on the court, how many play for one team?
Answer:
What is the direction exactly halfway between north and east called?
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When it is winter in Europe, a different season is going on in Australia, in the southern half of the Earth. Which one?
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The clock shows half past seven. How many minutes have passed since seven o'clock?
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If today is Wednesday, what day was the day before yesterday?
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How many days are there in three weeks?
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If today is Friday, what day will it be in three days?
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How many minutes are there in a quarter of an hour?
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A child was born in 2016. How old do they turn on their birthday in 2026?
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Answers (turn the page round) 1. zero (0) · 2. four (4) · 3. twelve (12) · 4. seven hundred and five (705) · 5. four (4) · 6. five (5) · 7. seven (7) · 8. fifteen (15) · 9. four (4) · 10. twenty (20) · 11. silent · 12. carrot · 13. eat · 14. five (5) · 15. wing · 16. audio · 17. the fox · 18. bones · 19. pink · 20. five (5) · 21. north-east · 22. summer · 23. thirty minutes (30) · 24. Monday · 25. twenty-one (21) · 26. Monday · 27. fifteen (15) · 28. ten (10)
Name: Date:
I am a prime number, and yet I am even. There is no other like me. Which number am I?
Answer:
Add up all the digits from zero to nine. What do you get?
Answer:
A snail climbs a staircase with ten steps. Each day it climbs three steps, and each night it slides back two. On which day does it reach the top?
Answer:
Which number comes next: 1, 1, 2, 3, 5, 8 …?
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A father and son are 36 years old together. The father is 26 years older than the son. How old is the son?
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I am a two-digit number. My digits add up to nine. When my digits swap places, I grow by 27. Which number am I?
Answer:
What is twenty-five per cent of eighty?
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What is the smallest number that can be divided exactly by three, by four and by five?
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Which number comes next: 1, 4, 9, 16 ...?
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Each boy in a family has as many brothers as sisters. Each girl has twice as many brothers as sisters. How many children are in the family?
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Three cats catch three mice in three minutes. How many cats are needed to catch a hundred mice in a hundred minutes?
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I am a number bigger than one and smaller than a hundred. I am the square of one number and the cube of another. Which number am I?
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How many digits do you write when you write every number from one to twenty?
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Which number continues the sequence: 2, 3, 5, 7, 11 ...?
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What is half of a third of sixty?
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Add one letter to the front of OWN and you get a place where many people live. Which word is it?
Answer:
Rearrange the letters of EARTH to get the part of your body that beats. Which word is it?
Answer:
Which letter continues the sequence: M, T, W, T, F, S ...?
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Which letter continues the sequence: J, F, M, A, M, J ...?
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If A = 1, B = 2, C = 3 and so on through the alphabet, which word do the numbers 3, 1, 20 spell?
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How many times does the letter A appear in the sentence: Anna has a banana?
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A water lily grows on a lake. Every day there is twice as much of it, and after ten days it covers the whole lake. On which day was half of the lake covered?
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A ladybird, an ant and a bee all have the same number of legs. How many?
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Five children sit together. How many fingers and toes do they have altogether?
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How many bones are there in one hand together with the wrist: 5, 14 or 27?
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A heart beats seventy times a minute. How many times does it beat in half an hour?
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Mixing red, green and blue paint on paper makes a dark, muddy colour. But which colour do you get when red, green and blue light are mixed?
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How many degrees do the three angles of any triangle add up to?
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If the day before yesterday was Saturday, what day will the day after tomorrow be?
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How many times in one day, from midnight to midnight, do the hour hand and the minute hand of a clock overlap?
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How many seconds are there in one hour?
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Every fourth year is a leap year, except full centuries that cannot be divided by four hundred. Will the year 2100 be a leap year?
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The Moon was full on Friday. In about how many days will it be full again?
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How many seconds are there in one whole day?
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It is ten in the morning. What time will it be in fifteen hours?
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If 1 January is a Monday, what day is 1 February?
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How many times a day does the long hand of a clock go all the way round?
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Which of these years was or will be a leap year: 1900, 2000, 2100 or 2200?
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When it is noon in Sarajevo, it is eleven o'clock in London. What time is it in London when it is eight in the evening in Sarajevo?
Answer:
Answers (turn the page round) 1. two (2) · 2. forty-five (45) · 3. on the eighth day · 4. thirteen (13) · 5. five (5) · 6. thirty-six (36) · 7. twenty (20) · 8. sixty (60) · 9. twenty-five (25) · 10. seven (four boys and three girls) · 11. three (3) · 12. sixty-four (64) · 13. thirty-one (31) · 14. thirteen (13) · 15. ten (10) · 16. town · 17. heart · 18. S · 19. J · 20. cat · 21. seven times (7) · 22. on the ninth day · 23. six (6) · 24. a hundred (100) · 25. twenty-seven (27) · 26. 2,100 · 27. white · 28. a hundred and eighty degrees (180°) · 29. Wednesday · 30. twenty-two times (22) · 31. 3,600 · 32. no · 33. about 29 days · 34. 86,400 · 35. one in the morning (1:00) · 36. Thursday · 37. twenty-four times (24) · 38. 2000 · 39. seven in the evening (19:00)
Maths and logic puzzles
Brain teasers need a little maths or logic: a sequence to continue, a hidden number, a snail on the stairs or a water lily that doubles. Each one has two hints that lead step by step.
How to solve them
Paper and a pencil help most. Draw, try and check: work the answer backwards and you will see whether it is right. Checking is half the work.
From preschool to teens
The youngest count syllables and shapes, while the oldest solve age puzzles, prime numbers and digit sums. Choose the age above the riddle.
Brain teasers for kids: every riddle with its answer
For reading aloud, in class or at home. The answer is hidden under each riddle.
4 to 6 Pick the picture
Clap once for each part of the word BA-NA-NA. How many claps is that?
Show the answer
Answer: three claps (3)
Did you know? These word parts are called syllables. Clapping them helps you read long words.
Clap once for each part of the word PEN-CIL. How many claps is that?
Show the answer
Answer: two claps (2)
Did you know? Pencil has two syllables, and pencil case has three: pen, cil, case.
Which letter is missing in the word C _ T?
Show the answer
Answer: the letter A
Did you know? When you look for a missing letter, say the whole word slowly.
When you mix yellow and blue paint, you get the colour of grass. Which colour is it?
Show the answer
Answer: green
Did you know? Yellow, blue and red are the primary colours. Mixing them makes almost every other colour.
When you mix red and yellow paint, you get the colour of a tangerine. Which colour is it?
Show the answer
Answer: orange
Did you know? The colour orange is named after the fruit of the same colour.
7 to 9 Choose or type
I am the smallest number written with two digits. Which number am I?
Show the answer
Answer: ten (10)
Did you know? Digits are the signs from 0 to 9. We build every number from them, the way we build words from letters.
I am an even number standing exactly halfway between six and ten. Which number am I?
Show the answer
Answer: eight (8)
Did you know? Even numbers end in 0, 2, 4, 6 or 8. All the others are odd.
Three birds sit on a branch. Two fly away, and then one more lands. How many birds are on the branch now?
Show the answer
Answer: two (2)
Did you know? When a problem has several steps, solve them in order, one step at a time.
I am an odd number between six and ten, but I am not seven. Which number am I?
Show the answer
Answer: nine (9)
Did you know? Odd numbers end in 1, 3, 5, 7 or 9.
What is half of ten?
Show the answer
Answer: five (5)
Did you know? Half of a number is the number that, added to itself, makes the whole: 5 + 5 = 10.
How many legs do five birds have altogether?
Show the answer
Answer: ten (10)
Did you know? To count legs, first find out how many one animal has, then count in jumps.
How many corners do two triangles have altogether?
Show the answer
Answer: six (6)
Did you know? Two times three is six. Multiplying is a quick way of adding the same number.
Add eight to me and you get fifteen. Which number am I?
Show the answer
Answer: seven (7)
Did you know? Taking away is the opposite of adding: 15 − 8 = 7, and 7 + 8 = 15.
Change the first letter of NEW to D and you get the tiny drops you find on the grass in the morning. Which word is it?
Show the answer
Answer: dew
Did you know? Dew forms at night when the air cools and the water in it gathers into drops on the cold grass.
Read the word STAR backwards. What do you get?
Show the answer
Answer: rats
Did you know? Some words make a different word backwards: star and rats, pot and top.
How many syllables are there in the word BUTTERFLY?
Show the answer
Answer: three (3)
Did you know? Butterfly splits like this: but, ter, fly.
One word does not belong: blue, red, green, chair. Which one?
Show the answer
Answer: chair
Did you know? Blue, red and green are colours, but a chair is an object. The odd one out is the chair.
How many baby teeth does a child have before they start falling out?
Show the answer
Answer: twenty (20)
Did you know? Children have twenty baby teeth, and adults have thirty-two grown-up teeth.
How many fingers and toes do you have altogether?
Show the answer
Answer: twenty (20)
Did you know? Your toes help you keep your balance when you walk and run.
How many different notes are in the scale: do, re, mi, fa, so, la, ti?
Show the answer
Answer: seven (7)
Did you know? After ti comes do again, only higher. That is why the scale repeats.
10 and 11 Type the answer
Multiply me by any number and you get me again. Which number am I?
Show the answer
Answer: zero (0)
Did you know? Any number multiplied by zero gives zero, and any number multiplied by one stays the same.
A tray of pie is cut into eight equal pieces. The family eats half. How many pieces were eaten?
Show the answer
Answer: four (4)
Did you know? We write a half as 1/2. Half of eight is four, and a quarter of eight is two.
I am three fours, and I am also two sixes. Which number am I?
Show the answer
Answer: twelve (12)
Did you know? Twelve splits into equal groups in many ways: into 2, 3, 4 or 6. Twelve of something is called a dozen.
I have three digits. The hundreds digit is 7, the tens digit is 0 and the ones digit is 5. Which number am I?
Show the answer
Answer: seven hundred and five (705)
Did you know? Zero holds the place. Without it, 705 would turn into 75, a much smaller number.
Double a number and add three. You get eleven. What was the number?
Show the answer
Answer: four (4)
Did you know? To find a hidden number, work backwards and do the opposite: subtract instead of adding, divide instead of multiplying.
What is a quarter of twenty?
Show the answer
Answer: five (5)
Did you know? We write a quarter as 1/4. Two quarters make a half.
Multiply me by myself and you get forty-nine. Which number am I?
Show the answer
Answer: seven (7)
Did you know? A number multiplied by itself is called its square: 7 × 7 = 49.
Which number comes next: 3, 6, 9, 12 ...?
Show the answer
Answer: fifteen (15)
Did you know? These are the multiples of three: what you get when you multiply three by 1, 2, 3, 4 and 5.
There are twenty-four children in a class. They split into groups of six. How many groups are there?
Show the answer
Answer: four (4)
Did you know? Dividing tells you how many times one number fits into another: 24 ÷ 6 = 4.
Each side of a square is five squares long on grid paper. How many squares long is the whole edge around it?
Show the answer
Answer: twenty (20)
Did you know? The distance around a shape is called its perimeter. For a square it is four times one side.
Rearrange the letters of LISTEN to get a word that means making no sound at all. Which word is it?
Show the answer
Answer: silent
Did you know? Words made from the same letters in a different order are called anagrams. Listen and silent are a famous pair.
One word does not belong: apple, pear, carrot, plum. Which one?
Show the answer
Answer: carrot
Did you know? A carrot is a vegetable, while apples, pears and plums are fruit. Sorting words into groups helps you remember them.
Rearrange the letters of TEA to get something you do at dinner. What is it?
Show the answer
Answer: eat
Did you know? Tea, eat and ate are all made from the same three letters.
How many words are in the sentence: The little rabbit hops away?
Show the answer
Answer: five (5)
Did you know? We leave a space between words in a sentence, so they are easy to count.
Which word is left when you take the first letter off SWING?
Show the answer
Answer: wing
Did you know? One letter can change a word completely: swing and wing mean very different things.
Which word has more vowels: KAYAK or AUDIO?
Show the answer
Answer: audio
Did you know? Audio has four vowels, A, U, I and O, in only five letters.
In the food chain grass, rabbit, fox, which one is the meat eater?
Show the answer
Answer: the fox
Did you know? A food chain shows who eats whom. Plants always come first.
A grown-up has two hundred and six of us, and a baby has even more. We are hard and white. What are we?
Show the answer
Answer: bones
Did you know? A baby has more bones than an adult, because some of them join together as you grow. Calcium from milk and cheese keeps them strong.
A painter mixes red and white. Which light colour do they get?
Show the answer
Answer: pink
Did you know? Adding white to any colour makes it lighter. Soft colours like that are called pastels.
Two teams play on a basketball court. If there are ten players on the court, how many play for one team?
Show the answer
Answer: five (5)
Did you know? In football each team has eleven players, in volleyball six, and in basketball five.
What is the direction exactly halfway between north and east called?
Show the answer
Answer: north-east
Did you know? Between the four main directions there are four more: north-east, south-east, south-west and north-west.
When it is winter in Europe, a different season is going on in Australia, in the southern half of the Earth. Which one?
Show the answer
Answer: summer
Did you know? The Earth is tilted. When the northern half leans away from the Sun, the southern half gets more sunshine, so the seasons are swapped.
The clock shows half past seven. How many minutes have passed since seven o'clock?
Show the answer
Answer: thirty minutes (30)
Did you know? An hour has sixty minutes. Half an hour is thirty, and a quarter of an hour is fifteen.
If today is Wednesday, what day was the day before yesterday?
Show the answer
Answer: Monday
Did you know? The day before yesterday is two days back, and the day after tomorrow is two days ahead.
How many days are there in three weeks?
Show the answer
Answer: twenty-one (21)
Did you know? Three weeks are three times seven days, a little less than a month.
If today is Friday, what day will it be in three days?
Show the answer
Answer: Monday
Did you know? When you count days, start from tomorrow: one day is Saturday, two is Sunday, three is Monday.
How many minutes are there in a quarter of an hour?
Show the answer
Answer: fifteen (15)
Did you know? An hour splits into four quarters of fifteen minutes, like a pizza cut into four slices.
A child was born in 2016. How old do they turn on their birthday in 2026?
Show the answer
Answer: ten (10)
Did you know? To work out an age, subtract the birth year from this year, but only once the birthday has passed.
12+ Hard riddles
I am a prime number, and yet I am even. There is no other like me. Which number am I?
Show the answer
Answer: two (2)
Did you know? The primes are 2, 3, 5, 7, 11, 13 and so on. Every other even number can be divided by two, so it cannot be prime.
Add up all the digits from zero to nine. What do you get?
Show the answer
Answer: forty-five (45)
Did you know? Pairing up is an old trick. A well known story says the mathematician Gauss added all the numbers from 1 to 100 this way as a boy.
A snail climbs a staircase with ten steps. Each day it climbs three steps, and each night it slides back two. On which day does it reach the top?
Show the answer
Answer: on the eighth day
Did you know? The trap in puzzles like this is the final step. Draw the stairs and follow the snail day by day.
Which number comes next: 1, 1, 2, 3, 5, 8 …?
Show the answer
Answer: thirteen (13)
Did you know? This is the Fibonacci sequence. You can find the same numbers in the spirals of sunflower seeds and pine cone scales.
A father and son are 36 years old together. The father is 26 years older than the son. How old is the son?
Show the answer
Answer: five (5)
Did you know? Check the answer: 5 + 31 = 36 and 31 − 5 = 26. Checking is half the work.
I am a two-digit number. My digits add up to nine. When my digits swap places, I grow by 27. Which number am I?
Show the answer
Answer: thirty-six (36)
Did you know? A number whose digits add up to nine can always be divided by nine. Try it: 36 ÷ 9 = 4.
What is twenty-five per cent of eighty?
Show the answer
Answer: twenty (20)
Did you know? Per cent means out of a hundred. Fifty per cent is a half, and twenty-five per cent is a quarter.
What is the smallest number that can be divided exactly by three, by four and by five?
Show the answer
Answer: sixty (60)
Did you know? The smallest number that all the given numbers divide into is called the lowest common multiple.
Which number comes next: 1, 4, 9, 16 ...?
Show the answer
Answer: twenty-five (25)
Did you know? These are square numbers. You can arrange that many dots into a square.
Each boy in a family has as many brothers as sisters. Each girl has twice as many brothers as sisters. How many children are in the family?
Show the answer
Answer: seven (four boys and three girls)
Did you know? Each boy has three brothers and three sisters, and each girl has four brothers and two sisters.
Three cats catch three mice in three minutes. How many cats are needed to catch a hundred mice in a hundred minutes?
Show the answer
Answer: three (3)
Did you know? First work out what one cat does. That is how you solve every workers and time puzzle.
I am a number bigger than one and smaller than a hundred. I am the square of one number and the cube of another. Which number am I?
Show the answer
Answer: sixty-four (64)
Did you know? 64 is 8 × 8, and also 4 × 4 × 4.
How many digits do you write when you write every number from one to twenty?
Show the answer
Answer: thirty-one (31)
Did you know? Nine one-digit numbers and eleven two-digit numbers: 9 + 22 = 31 digits.
Which number continues the sequence: 2, 3, 5, 7, 11 ...?
Show the answer
Answer: thirteen (13)
Did you know? These are the prime numbers. There are infinitely many of them, which was proved back in ancient Greece.
What is half of a third of sixty?
Show the answer
Answer: ten (10)
Did you know? Half of a third is a sixth. Sixty divided by six is ten.
Add one letter to the front of OWN and you get a place where many people live. Which word is it?
Show the answer
Answer: town
Did you know? Adding letters makes new words: own, town, towns. Words grow into families this way.
Rearrange the letters of EARTH to get the part of your body that beats. Which word is it?
Show the answer
Answer: heart
Did you know? Earth and heart are anagrams. Try others: listen and silent, night and thing.
Which letter continues the sequence: M, T, W, T, F, S ...?
Show the answer
Answer: S
Did you know? These are the first letters of the days of the week: Monday, Tuesday, Wednesday, Thursday, Friday, Saturday and Sunday.
Which letter continues the sequence: J, F, M, A, M, J ...?
Show the answer
Answer: J
Did you know? These are the first letters of the months: January, February, March, April, May, June, and next comes July.
If A = 1, B = 2, C = 3 and so on through the alphabet, which word do the numbers 3, 1, 20 spell?
Show the answer
Answer: cat
Did you know? This kind of code is very old. C is the 3rd letter, A the 1st and T the 20th.
How many times does the letter A appear in the sentence: Anna has a banana?
Show the answer
Answer: seven times (7)
Did you know? Counting letters takes care. It is easiest to go word by word and write the numbers down.
A water lily grows on a lake. Every day there is twice as much of it, and after ten days it covers the whole lake. On which day was half of the lake covered?
Show the answer
Answer: on the ninth day
Did you know? When something doubles every day, the last day adds as much as all the days before it put together.
A ladybird, an ant and a bee all have the same number of legs. How many?
Show the answer
Answer: six (6)
Did you know? Every insect has six legs and a body in three parts: head, thorax and abdomen.
Five children sit together. How many fingers and toes do they have altogether?
Show the answer
Answer: a hundred (100)
Did you know? We count in tens, probably because we have ten fingers.
How many bones are there in one hand together with the wrist: 5, 14 or 27?
Show the answer
Answer: twenty-seven (27)
Did you know? A hand with its wrist has 27 bones, which is why fingers can make such precise movements.
A heart beats seventy times a minute. How many times does it beat in half an hour?
Show the answer
Answer: 2,100
Did you know? Your heart beats your whole life without a rest, more than a hundred thousand times a day.
Mixing red, green and blue paint on paper makes a dark, muddy colour. But which colour do you get when red, green and blue light are mixed?
Show the answer
Answer: white
Did you know? A phone screen makes every colour from tiny red, green and blue dots of light.
How many degrees do the three angles of any triangle add up to?
Show the answer
Answer: a hundred and eighty degrees (180°)
Did you know? The angles in every triangle add up to 180 degrees, whatever the triangle looks like.
If the day before yesterday was Saturday, what day will the day after tomorrow be?
Show the answer
Answer: Wednesday
Did you know? Write the days in a row and move one step at a time. That is how every day puzzle is solved.
How many times in one day, from midnight to midnight, do the hour hand and the minute hand of a clock overlap?
Show the answer
Answer: twenty-two times (22)
Did you know? The minute hand catches the hour hand about every hour and five minutes, so there are fewer overlaps than hours.
How many seconds are there in one hour?
Show the answer
Answer: 3,600
Did you know? A minute has sixty seconds and an hour has sixty minutes, so an hour has sixty times sixty seconds.
Every fourth year is a leap year, except full centuries that cannot be divided by four hundred. Will the year 2100 be a leap year?
Show the answer
Answer: no
Did you know? The year 2000 was a leap year because it divides by 400, but 2100 will not be one.
The Moon was full on Friday. In about how many days will it be full again?
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Answer: about 29 days
Did you know? From one full moon to the next takes about twenty-nine and a half days. That is where the word month comes from.
How many seconds are there in one whole day?
Show the answer
Answer: 86,400
Did you know? A day has 24 hours, 1,440 minutes and 86,400 seconds.
It is ten in the morning. What time will it be in fifteen hours?
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Answer: one in the morning (1:00)
Did you know? A day has twenty-four hours, so after 24 the counting starts again.
If 1 January is a Monday, what day is 1 February?
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Answer: Thursday
Did you know? Every seven days the same weekday comes back, so you only count what is left after the full weeks.
How many times a day does the long hand of a clock go all the way round?
Show the answer
Answer: twenty-four times (24)
Did you know? The long hand goes round every hour, but the short hand only twice a day.
Which of these years was or will be a leap year: 1900, 2000, 2100 or 2200?
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Answer: 2000
Did you know? The four hundred rule came with the Gregorian calendar in 1582, to stop the calendar drifting away from the seasons.
When it is noon in Sarajevo, it is eleven o'clock in London. What time is it in London when it is eight in the evening in Sarajevo?
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Answer: seven in the evening (19:00)
Did you know? London lies further west, so the Sun reaches it later. That is why its clocks show an hour less.