What is the GCF of 75 and 90?

1 Answer
Oct 15, 2016

15

Explanation:

The simplest way to find the Greatest Common Factor is as follows:

  • Find one Common Factor
  • Divide by that factor
  • Look for a Common Factor in the new set of numbers
  • Divide by that factor
  • Repeat until you arrive at a dead end
  • Gather all of the factors that you used and multiply them together.
  • You should have the GCF now.

Your Question:
GCF of 75 and 90

  • They have a common factor of 5
  • 75/5 and 90/5 equal 15 and 18
  • 15 and 18 have Common Factor of 3
  • 15/3 and 18/3 equal 5 and 6
  • 5 and 6 do not have any Common Factors
  • We divided by 5 and 3.
  • 5*3=15