Factorials

Directions: 1) Copy down the important information and examples from the notes below. 2) Open the document called "Factorials Practice" and complete the practice problems.

Factorial is a shorthand way to write out a specific kind of multiplication. The symbol for factorial is an exclamation point (!).
 * Notes:**

//Example//: 4!

Factorial means that we should start with the number in front of the exclamation point and multiply it by every number less than that number (down to 1)

//Example//: 4! = 4 x 3 x 2 x 1 = 24 10! = 10 x 9 x 8 x 7 x 6 x 5 x 4 x 3 x 2 x 1 = 3,628,800

There is one exception to this rule: 0! = 1