What is the greatest common factor of 21ab and 35a?

Answer 1

The greatest common factor is 7a.

21ab+35a

=7a(3b+5)
GCF(21ab, 35a) = 7a. How? Factor out each term to get:

21ab = 3 x 7 x a x b

35a = 5 x 7 x a

The factors that occur both in 21ab and 35a are 7 and a. Therefore, the GCF is 7a.

Answer 2

The greatest common factor (GCF) is 7a2b2.

Answer 3

The GCF and LCM of 21 and 49 are 7 and 147 respectively

Answer 4

The GCF is 1.

Answer 5

The GCF is 7b.

Answer 6

The GCF is 1.

Answer 7

The GCF is 7.

Answer 8

7ab

Answer 9

21 and 49