GCF for 15 and 33

What is the Greatest Common Factor of 15 and 33?

Answer: GCF of 15 and 33 is 3

(Three)

Finding GCF for 15 and 33 using all factors (divisors) listing

The first method to find GCF for numbers 15 and 33 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 33: 1, 3, 11, 33

So the Greatest Common Factor for 15 and 33 is 3

Finding GCF for 15 and 33 by Prime Factorization

The second method to find GCF for numbers 15 and 33 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 33: 3, 11

As we can see there is only one Prime Factor common to both numbers. It is 3

So 3 is the Greatest Common Factor of 15 and 33

GCF Table

Number 1Number 2GCF
1331
2331
3333
4331
5331
633
7331
8331
933
10331
1133
1233
13331
14331
1533
16331
17331
1833
19331
20331
2133
2233
23331
2433
25331
2633
2733
28331
29331
30333

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 15 and 33? (The answer is: 3). Select the first number (e.g. '15') and the second number (e.g. '33'). 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 15 and 33?

GCF of 15 and 33 is 3