MATH RIDDLES

Fun Facts (Hints)

Different types of riddles have challenged people for centuries, here are a few facts about them that may give you some hints in solving these challenging questions:
  • Riddles in math are used by math teachers in many different cultures.
  • Many teachers promote the idea that giving students mathematical riddles helps to encourage their pupils to think more creatively and strategically.
  • These riddles are considered especially helpful in classrooms where students have emotional problems, as it pulls them away from their problems, and forces them to think creatively about what is before them.
  • Detectives are sometimes forced to solve riddles involving math when searching for psychopaths and serial killers.
  • Math riddles are used at home by many parents seeking to help their students become more engaged in their math schoolwork/homework.
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    Riddles and Answers © 2019

    How Many Batteries?

    Hint:
    7. If you break the batteries into 3 groups: Two groups of 3 and one group of 2. By doing this you guarantee that one of the groups has 2 working batteries. Both of the groups of 3 have 3 possible combinations of 2 batteries and the group of 2 only has 1 combination. So, 3 + 3 + 1 = 7 tries at most to find two working batteries.
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    Brownie Currency

    Hint:
    Just 2.

    Each time you give the owner of a bridge half of your brownies (1 brownie) they give you one back as well.
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    Find That Tennis Ball

    Hint:
    Put three of the balls on each side. If they are even the ball that wasn't weighed is the light one. If they aren't even the side that is lighter has the light ball. Of these three balls, one should be put on each side. If the sides are even than the other ball is the light one. If they aren't even the one that is lighter is the ball you're looking for.
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    The Same Birthday

    Hint:
    At least 23 people.
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    Chess Board

    Hint:
    No. When you remove the two diagonal spaces from the chess board they are both black or both white, making it so that there are two more of the other color. Each domino would cover 1 black and 1 white space. So 31 of them would have to cover 31 white spaces and 31 black spaces but with the corners removed there are 30 of one color and 32 of the other.
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    How Many People?

    Hint:
    9. Two twins are 2 people, three triplets are 3 people, and four quadruplets are 4 people. 2 + 3 + 4 = 9.
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    Toasting Toast

    Hint:
    3 minutes. She puts two pieces in the toaster, toasting one side of each. Then she flips one of them, takes one out, and puts the completely untoasted piece into the toaster. Finally, she takes out the toasted piece and puts the two half-toasted pieces of bread into the toaster for a minute and she's done.
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    How Many Pieces Of Chicken?

    Hint:
    After 6 all numbers divisible by 3 can be ordered (because they can all be expressed as a sum of 6's and 9's). After 26, all numbers divisible by three when subtracted by 20 can be obtained. After 46, all numbers divisible by three when subtracted by 40 can be obtained. After 46, all numbers fit into one of these 3 categories, so all numbers can be obtained. 43 is the last number that doesn't fall into one of these categories (44 = 20 + 6 * 4, 45 = 6 * 6 + 9).
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    Math Class

    Hint:
    He doesn't have math on Thursday.
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    Two Planes

    Hint:
    They will be the same distance away when they meet.
    Did you answer this riddle correctly?
    YES  NO  

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