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Pre Algebra: Factorials

A Factorial, usually seen written as n! is the product of all the integers that are less than n.

For example 6! = 6 x 5 x 4 x 3 x 2 x 1 = 720

It is very important to know that when dividing factorials you can reduce the common multiples.

For example 8! / 6! would be:

(8 x 7 x 6 x 5 x 4 x 3 x 2 x 1) / (6 x 5 x 4 x 3 x 2 x 1) and can be reduced to 8 x 7 = 56

Watch the video below for a detailed explanation!



Practice Math Problems

  1. What does 4! equal?
  2. What does 5! - 3! equal?
  3. What does 6! - 1! equal?
  4. What does 10! / 8! equal?
  5. What does 3! * 4! equal?
  6. What does 7! / 4! equal?
  7. What does 3! equal?
  8. What does 5! + 2! + 2! equal?
  9. What does 3! / 1! equal?
  10. What does 8! / 7! equal?
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