How to Build a Factor Tree You will need to use factors and prime numbers.

Factors 12: 1, 12 build the outside 12: 1, 2, 6, 12 Count up to yes, 2 x 6 12: 1, 2, 3, 4, 6, 12 Count up to yes, 3 x 4 12: 1, 2, 3, 4, 6, 12 Count up to it’s already there. SO YOU ARE DONE!!!!!! List the Factors 21: _________________ 36: _________________ 2: _________________ 49: _________________ 22: _________________

Prime Composite Prime Numbers Only 2 factors, 1 and itself 2: 1, 2 7: 1, 7 13: 1, 13 Prime is special! Composite More than 2 factors 4: 1, 2, 4 22: 1, 2, 11, 22 63: 1, 3, 7, 9, 21, 63 Welcome to the herd!

(2 x 2) x (2 x 3) (2 x 2) x (2 x 3) 4 x 6 = 24 4 x 6 = 24 (2 x 2) x (2 x 3) (2 x 2) x (2 x 3) 4 x 6 = 24 4 x 6 = 24 When building a tree, you need to end with prime numbers! There are many ways to build a tree, but you always end with the same prime numbers

BUILD YOUR FACTOR TREES Use factors to build your tree. End with prime numbers. Prove your tree by multiplying the prime numbers. Place ( ) around 2 numbers. Always multiply the numbers inside the ( ) first