Number Riddles

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• A barrel of water weighs 60 pounds. What must you put in it for it to weigh 40 pounds?

  A hole

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• How many times can you subtract the number 5 from 25?

  Once, because after you subtract 5 it's not 25 anymore

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• What two whole, positive numbers that have a one-digit answer when multiplied and a two-digit answer when added?

  1 and 9

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• What two whole, positive numbers have the same answer when multiplied together as when added together?

  2 and 2

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• What three whole, positive numbers have the same answer when multiplied together as when added together?

  1, 2, and 3

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