[Math Lair] Riddles

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Here are a few interesting riddles to try. Many of them have a catch, so read them all carefully!

  1. You have 30¢ in two current U.S. coins. One of them is not a nickel. What are the two coins?
  2. Some months have 30 days. Some months have 31 days. How many months have 28 days?
  3. Is it correct to say "seven and five is thirteen" or "seven and five are thirteen"?
  4. If you have only one match and you enter a room in which there is a kerosene lamp, a fireplace, and a wood-burning stove, what should you light first?
  5. If you take three apples from five apples, how many apples do you have?
  6. A farmer has three haystacks in one field, five haystacks in a second field, and four haystacks in a third field. If he puts them all together, how many haystacks will he have?
  7. How many times can 17 be subtracted from 170?
  8. It takes twelve one-cent stamps to make a dozen. How many four-cent stamps does it take to make a dozen?
  9. A farmer had 17 sheep. All but 9 died. How many were left?
  10. How much dirt is in a hole 3 feet wide by 3 feet long by 2 feet deep?

Answers are on the answers page.

If you enjoyed these riddles, you may also enjoy lateral thinking puzzles.