Start with the number
Multiply it by every positive integer below it
Continue until you reach 1
Use the formula n! = n × (n – 1) × (n – 2) × … × 2 × 1
Example: 5! = 5 × 4 × 3 × 2 × 1 = 120
Remember that 0! = 1
Start with the number
Multiply it by every positive integer below it
Continue until you reach 1
Use the formula n! = n × (n – 1) × (n – 2) × … × 2 × 1
Example: 5! = 5 × 4 × 3 × 2 × 1 = 120
Remember that 0! = 1