GCF for 15 and 90

"Greatest Common Factor" Calculator

Greatest Common Factor of

and

What is the Greatest common Divisor of 15 and 90?

Answer: GCF of 15 and 90 is 15

(Fifteen)

Finding GCF for 15 and 90 using all factors (divisors) listing

The first method to find GCF for numbers 15 and 90 is to list all factors for both numbers and pick the highest common one:

All factors of 15: 1, 3, 5, 15

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

So the Greatest Common Factor for 15 and 90 is 15

Finding GCF for 15 and 90 by Prime Factorization

The second method to find GCF for numbers 15 and 90 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 15: 3, 5

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

As we can see there are Prime Factors common to both numbers: 3, 5

Now we need to multiply them to find GCF: 3 × 5 = 15

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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 Divisor of 15 and 90? (The answer is: 15). Select the first number (e.g. '15') and the second number (e.g. '90'). 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

"Greatest Common Factor" Calculator

Greatest Common Factor of

and

GCF Table

Number 1Number 2GCF
1901
2902
3903
4902
5905
6906
7901
8902
9909
109010
11901
12906
13901
14902
159015
16902
17901
189018
19901
209010
21903
22902
23901
24906
25905
26902
27909
28902
29901
309030

FAQ

What is the Greatest common Divisor of 15 and 90?

GCF of 15 and 90 is 15

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