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Math riddles

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  • 9 + 2 = 711, 14 + 6 = 820, 17 + 11 = 628. What is 12 + 3 = ?
    915 (12-3)(12+3)
  • What can travel around the world while staying in a corner.
    A stamp
  • If you multiply this number by any other number, the answer will always stay the same. What number am I?
    Zero
  • The number 5 is transformed to be 11. The number 7 is transformed to be 15. The number 9 is transformed to be 19. What happens to the number 12?
    It is transformed to be 25. The formula: N times 2 and then add 1.
  • I am 3/8 Tortoise, 2/5 onion, and 2/6 tomato. Who am I?
    Toronto
  • An online bookstore sells novels and magazines. Each novel sells for $4, and each magazine sells for $1. If Sadie purchased a total of 10 novels and magazines that have a combined selling price of $20, how many novels did she purchase?
    3
  • You are given 3 positive numbers. You can add these numbers and multiply them together. The result you get will be the same. What are the numbers?
    1, 2 and 3
  • If you were to write a random whole number between 1 and 10, then what are the chances that the number will be odd?
    50%
  • What is the square root of 625?
    25
  • I am an odd number. Take away a letter and I become even. What number am I?
    Seven
  • What has 12 faces and 42 eyes?
    A pair of dice
  • A grandfather, two fathers and two sons went to the movie theater together and everyone bought one ticket each. How many tickets did they buy in total?
    3 {the grandfather is also a father and the father are also a son.}
  • The sum of two consecutive numbers is 37. What are those TWO numbers?
    18 and 19
  • If there are 4 apples and you take away 3, how many apples do YOU have?
    3 apples
  • What do you get when you multiply all of the numbers on a phone pad? ANSWER WITHIN 30 SECONDS!
    0
  • 100 x 0.25
    25
  • Tom asked his grandma how old she was. She said this: "I have 6 children, and they are 4 years apart I had my first child when I was 19. Now her youngest one is 19 herself." How old is tom's grandma?
    58
  • One + Nine + Eight =?
    ONE
  • Two + Eight + Nine=?
    TEN
  • 25% of 1,000 =?
    250