How do you solve high common factor?

Answer 1

Common factor questions will give you some numbers (usually two, but can be more) and ask you to find the common factors. Example: 30 and 42

List the factors of each number.

1, 2, 3, 5, 6, 10, 15, 30

1, 2, 3, 6, 7, 14, 21, 42

Write down the numbers that appear on both lists.

1, 2, 3 and 6 are the common factors of 30 and 42.

Answer 2

Example: 30 and 42
Factor them.
2 x 3 x 5 = 30
2 x 3 x 7 = 42
Select the common factors.
2 x 3 = 6, the GCF

Answer 3

Example: 30 and 42

Factor them.

2 x 3 x 5 = 30

2 x 3 x 7 = 42

Select the common factors.

2 x 3 = 6, the GCF