Question

What is the GCF of 75 and 90?

Answer 1

`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`