➗ 25 maths riddles with answers
25 maths riddles for kids, with answers and working
Maths riddles turn numbers into little mysteries. Read one, work it out on paper and then tap to check. They get harder as you go down the list.
How to play
- Write the numbers down. Most maths riddles are solved by trying them on paper.
- Check your answer by putting it back into the riddle.
- Make up a number riddle for someone at home.
I am a number. Double me and add 6 and you get 20. What number am I?
7. Double 7 is 14 and 14 + 6 = 20.
What number is twice as big as 15 and also half as big as 60?
30. Twice 15 is 30 and half of 60 is 30.
I have four equal sides and four right angles. What shape am I?
A square.
If you multiply me by any number, the answer is always zero. What am I?
Zero.
I am an even number less than 10 and I am also a perfect square. What am I?
4, because 2 × 2 = 4.
Two numbers add up to 10 and multiply to 21. What are they?
3 and 7. 3 + 7 = 10 and 3 × 7 = 21.
I am a two-digit number less than 50. My digits add up to 9 and I am a multiple of 5. What am I?
45. 4 + 5 = 9 and 45 is 5 × 9.
What comes next: 2, 4, 8, 16, ...?
32. Each number is double the one before.
I am the smallest prime number. What am I?
2. It is the only even prime.
How many sides does a hexagon have plus how many days are in a week?
13. A hexagon has 6 sides and a week has 7 days, so 6 + 7 = 13.
A dozen eggs cost ₹84. How much does one egg cost?
₹7, because 84 ÷ 12 = 7.
Rohan had 50 marbles. He lost 15 and then won 8. How many does he have now?
43. 50 − 15 = 35 and 35 + 8 = 43.
What is half of a quarter of 80?
10. A quarter of 80 is 20 and half of 20 is 10.
I am between 20 and 30 and I can be divided exactly by both 3 and 4. What am I?
24. It is in both the 3 and 4 times tables.
What is 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10?
55. Pair them: 1 + 10, 2 + 9, and so on make 5 pairs of 11.
How many minutes are there in two and a half hours?
150 minutes. 2 × 60 = 120 and half an hour is 30.
A train leaves at 9:45 and the journey takes 2 hours 30 minutes. When does it arrive?
12:15. 9:45 plus 2 hours is 11:45 and 30 more minutes is 12:15.
I am an odd number. Take away one letter and I become even. What number am I?
Seven. Take away the letter S and you get EVEN.
How many legs do 5 spiders and 3 cats have in all?
52. Spiders have 8 legs: 5 × 8 = 40. Cats have 4: 3 × 4 = 12. 40 + 12 = 52.
If 3 pencils cost ₹15, how much do 7 pencils cost?
₹35. One pencil costs ₹5 and 7 × 5 = 35.
Which is bigger, 0.5 or 0.45?
0.5. Five tenths is more than four tenths.
I am a three-digit number. My hundreds digit is 1, my tens digit is double the hundreds digit and my ones digit is double the tens digit. What am I?
124. The digits are 1, 2 and 4.
I am the sum of the first four odd numbers. What am I?
16. 1 + 3 + 5 + 7 = 16.
What is 25% of 200?
50. A quarter of 200 is 50.
How many seconds are there in 3 minutes?
180 seconds. 3 × 60 = 180.
FAQ
Maths riddles for kids: questions people ask
What age are these maths riddles for?
Most suit ages 7 to 12. The first few are good for younger children and the last few need two steps.
Do maths riddles help with school maths?
They practise number sense, reasoning and reading carefully, which all help with word problems.
Are the answers correct?
Yes. Every numeric answer is checked by automated tests.
Where can I find more?
Try our maths quizzes, number puzzles and magic tricks.
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