What is the greatest common factor of 7 21 and 35?

Answer 1

The GCF of 7, 21 and 35 is 7. This leaves you with 1, 3 and 5 respectively, You can go no further as the only common factor remaining is 1.

The factors of 7 are: 1, 7

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

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

The common factors are: 1, 7

The Greatest Common Factor (GCF) is: 7

Answer 2

Find the GCF of 21 and 35.

3 x 7 = 21

5 x 7 = 35

The GCF is 7.

Find what is common between ab and a.

a is common.

The answer is 7a.

Answer 3

The greatest common divisor can be found by finding the HCF of the two numbers.

The greatest common divisor of the given two numbers, i.e. 21 and 35 is 7.

Answer 4

The factors of 21 are:

1, 3, 7, 21

The factors of 35 are:

1, 5, 7, 35

The common factors are:

1, 7

The Greatest Common Factor:

GCF = 7

Answer 5

21 = 3 x 7

35 = 5 x 7

GCF = 7

Answer 6

5a