Question 1

I am a number that is one less than a dozen. What number am I?

Accepted Answer

11. A dozen is 12, so one less is 11.

Question 2

I am a series of numbers: 2, 4, 8, 16... What is the next number in my sequence?

Accepted Answer

32. Each term doubles the previous term: 16 x 2 = 32.

Question 3

I am an even number. I can be divided by 2 without a remainder. What am I?

Accepted Answer

Eight. Four is an even number and can be divided by 2.

Question 4

I am a number whose square is less than 100 but greater than 50. What number am I?

Accepted Answer

9. 8 squared is 64, which fits the criteria.

Question 5

I am a cube of a certain number. When you add 6 to me, I become 64. What number am I?

Accepted Answer

4. Let the number be x. The equation x^3 + 6 = 64 leads to x^3 = 58, which gives x = 4 as the integer solution since 4^3 = 64 - 6.

Question 6

I am the number of days in a week, what could I be?

Accepted Answer

7. There are seven days in a week.

Question 7

I am a number. Multiply me by 3, then subtract 9, and you get 15. What number am I?

Accepted Answer

8. To find the number, add 9 to 15 (which gives you 24) and then divide by 3 (which gives you 8).

Question 8

I am an age that is half of 50 but twice of 15. What age am I?

Accepted Answer

25. Half of 50 is 25, and twice of 15 is also 30.

Question 9

I am a number. If you subtract me from 15, you get 10. What number am I?

Accepted Answer

5. Subtracting 5 from 15 results in 10.

Question 10

I have a jar with 10 candies. If I add 5 more, how many do I have?

Accepted Answer

15. 10 candies plus 5 additional candies equals 15.

Question 11

I am a pair of numbers that add up to 10. One is even, the other is odd. What are we?

Accepted Answer

2 and 8. The numbers 2 (even) and 8 (even) add to 10.

Question 12

I have a coin that is worth 5 cents, but it’s not a nickel. What is it?

Accepted Answer

A penny and a four-cent coin. The riddle hints at combining different coins to reach the total, hence a penny and a four-cent coin (although the latter doesn't exist, it's a playful twist).

Question 13

I am a number that is prime, the sum of my digits is 10, and I am under 50. What am I?

Accepted Answer

37. 37 is the only prime number under 50 where the sum of its digits equals 10.

Question 14

I am one third of nine. What number am I?

Accepted Answer

A number equal to three. One third of nine is three.

Question 15

I am the sum of the first five even numbers. What number am I?

Accepted Answer

30. The sum is 2 + 4 + 6 + 8 + 10 = 30.

Question 16

I can emerge from multiplying two by four. I am larger than ten. What am I?

Accepted Answer

A number eight. The number eight is the product of two times four.

Question 17

I am the sum of three and one, and I’m often used to count. What am I?

Accepted Answer

A four. A four is what you get when you sum three and one.

Question 18

I am a pair of numbers whose product is 24 and whose difference is 2. What numbers am I?

Accepted Answer

6 and 4. The correct pair is 6 and 4 because 6 * 4 = 24 and 6 - 4 = 2.

Question 19

I am a three-sided shape, and my angles add up to a number. What is that number?

Accepted Answer

one hundred eighty. The sum of angles in any triangle is always 180 degrees.

Question 20

I am a Fibonacci number that is greater than 20 but less than 40. What number am I?

Accepted Answer

21. The Fibonacci sequence is 0, 1, 1, 2, 3, 5, 8, 13, 21, 34... and 21 fits the criteria.

Question 21

I can be a result of adding two even numbers. What number am I?

Accepted Answer

Even number. The sum of two even numbers is always another even number.

Question 22

I am the area of a circle with a radius of 5 units. What is my area?

Accepted Answer

78.54. Using π (approximately 3.14), the area is π * 5² = 78.54.

Question 23

I am the next number in the sequence: 1, 2, 3, ___. What am I?

Accepted Answer

4. The next number after 3 in the sequence is 4.

Question 24

I am the result of two squared forms adding together. What number am I?

Accepted Answer

A fifty. 5^2 + 5^2 equals 25 + 25, resulting in 50.

Question 25

I can be expressed as the sum of the first n cubes. What formula describes me?

Accepted Answer

((n(n + 1)) / 2)². The sum of the first n cubes equals the square of the nth triangular number, which is ((n(n + 1)) / 2)².

Question 26

I can close gaps when added, but I do not have a form. What am I?

Accepted Answer

A sum. A sum is the result of adding numbers together.

Question 27

I am a collection of items, but I can show different amounts. What am I?

Accepted Answer

A set. A set represents a collection of distinct elements.

Question 28

I can be solved using the formula that involves b squared minus four ac. What am I?

Accepted Answer

Quadratic equation. The quadratic equation is of the form ax² + bx + c = 0.

Question 29

I am the inverse of exponentiation, helping you find the missing exponent. What am I?

Accepted Answer

Logarithm. The logarithm is the operation that determines the exponent needed to produce a given number.

Question 30

I am a division where the answer is less than one, often used in fractions. What am I?

Accepted Answer

Proper fraction. A proper fraction has a numerator smaller than its denominator, resulting in a value less than 1.

Question 31

I am the smallest prime number. What am I?

Accepted Answer

A two. Two is the first prime number.

Question 32

I am the shape with no corners and a constant width. What am I?

Accepted Answer

Ellipse. A circle has no corners and is round.

Question 33

I can give you direction, but I have no physical body. What am I?

Accepted Answer

A coordinate. A coordinate provides a way to determine positions in space.

Question 34

I can double your number, but I am not a calculator. What am I?

Accepted Answer

A factor. A factor can increase a number when multiplied.

Question 35

I am a two-digit number whose square is also a two-digit number. What number am I?

Accepted Answer

76. 76 is the only two-digit number whose square, 5776, is a four-digit number and its digits sum to 20.

Question 36

I am a number. If you divide me by 2, I become 5. What number am I?

Accepted Answer

10. Dividing 10 by 2 gives you 5, making it the correct answer.

Question 37

I am a two-digit number. When you add my digits together, you get 8. What number am I?

Accepted Answer

44. The digits of 53 (5 + 3) add up to 8.

Question 38

I am the total of the digits in thirty-five multiplied by two. What am I?

Accepted Answer

A sixteen. 3 + 5 = 8 and 8 * 2 = 16.

Question 39

I am a total of five items, each worth four. What is the combined worth?

Accepted Answer

The number twenty. If you have five items worth four each (5 x 4), the total is twenty.

Question 40

I am a number that, when added to three, gives you seven. What am I?

Accepted Answer

The number four. Four added to three equals seven (4 + 3 = 7).

Question 41

I am a fruit that can be divided to get the same number. What am I?

Accepted Answer

A grape. The word 'pear' sounds like 'pair', which can refer to two.

Question 42

I have rungs but I'm not a ladder. I can be tall or short, what am I?

Accepted Answer

A number scale. A number line has 'rungs' of numbers and can stretch infinitely.

Question 43

I am a box with no corners, what am I?

Accepted Answer

A cylinder. A circle has no corners, unlike the others.

Question 44

I am a prime number that is the sum of two other prime numbers. What number am I?

Accepted Answer

5. 5 can be expressed as 2 + 3, both primes.

Question 45

I can increase your size but also make you smaller. What am I?

Accepted Answer

A factor. A factor is a number that divides another number without leaving a remainder.

Question 46

I have a collection of coins: 3 dimes and 2 quarters. What is the total value in cents?

Accepted Answer

85. 3 dimes = 30 cents, 2 quarters = 50 cents; total = 30 + 50 = 90 cents.

Question 47

I am a shape with four sides, but my opposite sides are equal. What am I?

Accepted Answer

Rectangle. A rectangle has opposite sides equal.

Question 48

I am what is left after division, a shadow of the original. What am I?

Accepted Answer

Remainder. The remainder is what remains after performing division when the numbers do not divide evenly.

Question 49

I am a fraction that, when inverted, equals 3 times my original value. What fraction am I?

Accepted Answer

1/3. If x = 1/3, then 1/x = 3, confirming that it meets the conditions of the riddle.

Question 50

I am a number whose digital root is 9. What could I be?

Accepted Answer

18. The digital root is the repeated sum of digits until a single-digit number is achieved. For 18, 1 + 8 = 9.

Math Riddles with Answers

1. I am a number that is one less than a dozen. What number am I?

2. I am a series of numbers: 2, 4, 8, 16... What is the next number in my sequence?

3. I am an even number. I can be divided by 2 without a remainder. What am I?

4. I am a number whose square is less than 100 but greater than 50. What number am I?

5. I am a cube of a certain number. When you add 6 to me, I become 64. What number am I?

6. I am the number of days in a week, what could I be?

7. I am a number. Multiply me by 3, then subtract 9, and you get 15. What number am I?

8. I am an age that is half of 50 but twice of 15. What age am I?

9. I am a number. If you subtract me from 15, you get 10. What number am I?

10. I have a jar with 10 candies. If I add 5 more, how many do I have?

11. I am a pair of numbers that add up to 10. One is even, the other is odd. What are we?

12. I have a coin that is worth 5 cents, but it’s not a nickel. What is it?

13. I am a number that is prime, the sum of my digits is 10, and I am under 50. What am I?

14. I am one third of nine. What number am I?

15. I am the sum of the first five even numbers. What number am I?

16. I can emerge from multiplying two by four. I am larger than ten. What am I?

17. I am the sum of three and one, and I’m often used to count. What am I?

18. I am a pair of numbers whose product is 24 and whose difference is 2. What numbers am I?

19. I am a three-sided shape, and my angles add up to a number. What is that number?

20. I am a Fibonacci number that is greater than 20 but less than 40. What number am I?

21. I can be a result of adding two even numbers. What number am I?

22. I am the area of a circle with a radius of 5 units. What is my area?

23. I am the next number in the sequence: 1, 2, 3, ___. What am I?

24. I am the result of two squared forms adding together. What number am I?

25. I can be expressed as the sum of the first n cubes. What formula describes me?

26. I can close gaps when added, but I do not have a form. What am I?

27. I am a collection of items, but I can show different amounts. What am I?

28. I can be solved using the formula that involves b squared minus four ac. What am I?

29. I am the inverse of exponentiation, helping you find the missing exponent. What am I?

30. I am a division where the answer is less than one, often used in fractions. What am I?

31. I am the smallest prime number. What am I?

32. I am the shape with no corners and a constant width. What am I?

33. I can give you direction, but I have no physical body. What am I?

34. I can double your number, but I am not a calculator. What am I?

35. I am a two-digit number whose square is also a two-digit number. What number am I?

36. I am a number. If you divide me by 2, I become 5. What number am I?

37. I am a two-digit number. When you add my digits together, you get 8. What number am I?

38. I am the total of the digits in thirty-five multiplied by two. What am I?

39. I am a total of five items, each worth four. What is the combined worth?

40. I am a number that, when added to three, gives you seven. What am I?

41. I am a fruit that can be divided to get the same number. What am I?

42. I have rungs but I'm not a ladder. I can be tall or short, what am I?

43. I am a box with no corners, what am I?

44. I am a prime number that is the sum of two other prime numbers. What number am I?

45. I can increase your size but also make you smaller. What am I?

46. I have a collection of coins: 3 dimes and 2 quarters. What is the total value in cents?

47. I am a shape with four sides, but my opposite sides are equal. What am I?

48. I am what is left after division, a shadow of the original. What am I?

49. I am a fraction that, when inverted, equals 3 times my original value. What fraction am I?

50. I am a number whose digital root is 9. What could I be?