GCF for 90 and 155

What is the Greatest Common Factor of 90 and 155?

Answer: GCF of 90 and 155 is 5

(Five)

Finding GCF for 90 and 155 using all factors (divisors) listing

The first method to find GCF for numbers 90 and 155 is to list all factors for both numbers and pick the highest common one:

All factors of 90: 1, 2, 3, 5, 6, 9, 10, 15, 18, 30, 45, 90

All factors of 155: 1, 5, 31, 155

So the Greatest Common Factor for 90 and 155 is 5

Finding GCF for 90 and 155 by Prime Factorization

The second method to find GCF for numbers 90 and 155 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 90: 2, 3, 3, 5

All Prime Factors of 155: 5, 31

As we can see there is only one Prime Factor common to both numbers. It is 5

So 5 is the Greatest Common Factor of 90 and 155

GCF Table

Number 1Number 2GCF
751555
761551
771551
781551
791551
801555
811551
821551
831551
841551
851555
861551
871551
881551
891551
901555
911551
921551
9315531
941551
951555
961551
971551
981551
991551
1001555
1011551
1021551
1031551
1041551

About "Greatest Common Factor" Calculator

This calculator will help you find the greatest common factor (GCF) of two numbers. For example, it can help you find out what is the Greatest Common Factor of 90 and 155? (The answer is: 5). Select the first number (e.g. '90') and the second number (e.g. '155'). After that hit the 'Calculate' button.
Greatest Common Factor (GCF) also known as the Greatest Common Divisor (GCD) or Highest Common Factor (HCF) - it is the largest positive integer that divides each of the integers with zero remainder

FAQ

What is the Greatest Common Factor of 90 and 155?

GCF of 90 and 155 is 5