answersLogoWhite

0

The greatest common factor can be calculated by identifying the common prime factors and multiplying them together.

The prime factors of 280 are 2, 2, 2, 5, and 7.

The prime factors of 420 are 2, 2, 3, 5, and 7.

The common prime factors are 2, 2, 5, and 7, so the greatest common factor is 2 x 2 x 5 x 7 = 140. The GCF is 140.

User Avatar

Wiki User

9y ago

What else can I help you with?