Question

Find the greatest common factor of 21 and 33

Answer 1

`GCF=3`

Explanation:

1) List the factors of each number.

Factors of 21:
`1,3,7,21`

Factors of 33:
`1,3,11,33`

2) Find the largest number that is shared by all rows above. This is the GCF.

`GCF=3`

Answer 2

As you can see when you list out the factors of each number, 3 is the greatest number that 21 and 33 divides into.

Explanation:

As you can see when you list out the factors of each number, 3 is the greatest number that 21 and 33 divides into.