Finding the GCFFinding the GCF

By KristianBy Kristian

Figure Out Your First Figure Out Your First Number.Number.• My number is 80My number is 80

Divide your number.Divide your number.

• 8080

• 20 420 4

Divide your numbers into their Divide your numbers into their prime factors.prime factors.

• 8080

• 20 420 4

• 5 4 2 25 4 2 2

2 22 2

Do all the steps over again Do all the steps over again with a different number.with a different number.

• 100100

• 50 250 2

• 5 105 10

• 2 52 5

Figure out what prime numbers Figure out what prime numbers both have.both have.

• 8080

• 20 4 20 4

• 55 4 4 2 2 22

• 2 22 2• • 100 100 50 50 22

55 10 10

22 5 5

Multiply the numbers.Multiply the numbers.

• 5x2x2=205x2x2=20

The answer is the GCF.The answer is the GCF.

• 20 is my GCF.20 is my GCF.