Answer:

B. review: "What's the Greatest"

Find the GCF of the following set of number using listing method or prime factorization.

Given Number Greatest commonfactors

1. 6, 8, 10, 20 | 2

2. 14, 21 | 7

3. 5, 7, 12 | 1

4. 4, 12, 20 | 4

5. 10, 20, 30, 35 | 5

Step-by-step explanation:

1.) The factors of 6 are: 1, 2, 3, 6

The factors of 8 are: 1, 2, 4, 8

The factors of 10 are: 1, 2, 5, 10

The factors of 20 are: 1, 2, 4, 5, 10, 20

Then the greatest common factor is 2.

2.) The factors of 14 are: 1, 2, 7, 14

The factors of 21 are: 1, 3, 7, 21

Then the greatest common factor is 7.

3.) The factors of 5 are: 1, 5

The factors of 7 are: 1, 7

The factors of 12 are: 1, 2, 3, 4, 6, 12

Then the greatest common factor is 1.

4.) The factors of 4 are: 1, 2, 4

The factors of 12 are: 1, 2, 3, 4, 6, 12

The factors of 20 are: 1, 2, 4, 5, 10, 20

Then the greatest common factor is 4.

5.) The factors of 10 are: 1, 2, 5, 10

The factors of 20 are: 1, 2, 4, 5, 10, 20

The factors of 30 are: 1, 2, 3, 5, 6, 10, 15, 30

The factors of 35 are: 1, 5, 7, 35

Then the greatest common factor is 5.

Hope it helps (・∀・)