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Number Riddles:  The purpose of this collection is to entertain the brain.  The correct answer to this set of number riddles isn't always the obvious one.  Print these number riddles and add some fun to your kids lunch or use as a fun riddle excercise for the classroom. Enjoy!

Riddle:

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

Answer:

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

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Riddle:

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

Answer:

1 and 9.

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Riddle:

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

Answer:

2 and 2.

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Riddle:

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

Answer:

1, 2 and 3.  1 x 2 x 3 = 1 + 2 + 3 = 6

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Riddle:

What two-digit numbers are each equal to their right-most digit squared?

Answer:

25 = 5² and 36 = 6².

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Riddle:

What two-digit number equals two times the result of multiplying its digits?

Answer:

36 = 2 x 3 x 6.

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Riddle:

What two whole, positive numbers have the same answer when multiplied together as when one is divided by the other?

Answer:

Any number and 1.

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Riddle:

How is half of nine four?

Answer:

In Roman Numerals, nine is IX and four is IV. If you take IX and cut it in half horizontally, you will get IV.

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Riddle:

What is the highest number that can be written with three digits?

Answer:

(9⁹)⁹ = 9³⁸⁷⁴²⁰⁴⁸⁹, which is a number with more than 369 million digits.

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Riddle:

What number can you subtract half from to obtain a result of zero?

Answer:

The number 8.  It's made up of two zeros, one on top of the other.

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Numbers Riddles Answers:

  1. Once, because after you subtract it's not 25 anymore.
  2. 1 and 9.
  3. 2 and 2.
  4. 1, 2 and 3.  1 x 2 x 3 = 1 + 2 + 3 = 6
  5. 25 = 5² and 36 = 6².
  6. 36 = 2 x 3 x 6.
  7. Any number and 1.
  8. In Roman Numerals, nine is IX and four is IV. If you take IX and cut it in half horizontally, you will get IV.
  9. (9⁹)⁹ = 9³⁸⁷⁴²⁰⁴⁸⁹, which is a number with more than 369 million digits.
  10. The number 8.  It's made up of two zeros, one on top of the other.