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

How to Build a Factor How to Build a Factor TreeTree

You will need to use factors and prime numbers.

Factors

12: 1, 12build the outside

12: 1, 2, 6, 12Count up to 2 --- yes, 2 x 6

12: 1, 2, 3, 4, 6, 12Count up to 3 --- yes, 3 x 4

12: 1, 2, 3, 4, 6, 12Count up to 4 --- it’s already there.

SO YOU ARE DONE!!!!!!

List the Factors

21: _________________

36: _________________

2: _________________

49: _________________

22: _________________

Prime Composite 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 tothe herd!

(2 x 2) x (2 x 3) (2 x 2) x (2 x 3)(2 x 2) x (2 x 3) (2 x 2) x (2 x 3) 4 x 6 = 24 4 x 6 = 4 x 6 = 24 4 x 6 = 2424

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.

24

4 6

22 2

24

32 2

34

2 12

BUILD YOUR FACTOR TREES 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.

30

18

9

60

81

Factor tree answers. Factor tree answers.

30 3 x (2 x 5) 3 x 10 = 30

18 (2 x 3) x 3 6 x 3 = 18

30

3

2

10

5

30

2

5

15

3

18

3 3

32

6 3

92

18

Factor tree answersFactor tree answers

3 x 3 = 9

work this one out

These are the prime factors:(5 x 2) x (2 x 3)

work this

one out

These are the prime factors:(3 x 3) x (3 x 3)

9

3 3

60

81

Keep up the good work. Keep up the good work.

NOW TRY SOME ON YOUR OWN.

LET ME SEE YOUR WORK. BRING IT TO CLASS.