GCF for 28 and 30

"Greatest Common Factor" Calculator

Greatest Common Factor of

and

What is the Greatest Common Divisor of 28 and 30?

Answer

GCF of 28 and 30 is 2

(Two)

Finding GCF for 28 and 30 using all factors (divisors) listing

The first method to find GCF for numbers 28 and 30 is to list all factors for both numbers and pick the highest common one:

All factors of 28: 1, 2, 4, 7, 14, 28

All factors of 30: 1, 2, 3, 5, 6, 10, 15, 30

So the Greatest Common Factor for 28 and 30 is 2

Finding GCF for 28 and 30 by Prime Factorization

The second method to find GCF for numbers 28 and 30 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 28: 2, 2, 7

All Prime Factors of 30: 2, 3, 5

As we can see there is only one Prime Factor common to both numbers. It is 2

So 2 is the Greatest Common Factor of 28 and 30

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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 28 and 30? (The answer is: 2). Select the first number (e.g. '28') and the second number (e.g. '30'). 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 1 Number 2 GCF
13 30 1
14 30 2
15 30 15
16 30 2
17 30 1
18 30 6
19 30 1
20 30 10
21 30 3
22 30 2
23 30 1
24 30 6
25 30 5
26 30 2
27 30 3
28 30 2
29 30 1
30 30 30
31 30 1
32 30 2
33 30 3
34 30 2
35 30 5
36 30 6
37 30 1
38 30 2
39 30 3
40 30 10
41 30 1
42 30 6

FAQ

What is the Greatest Common Divisor of 28 and 30?
GCF of 28 and 30 is 2

How to find the GCF of 28 and 30?
You can find the GCF of 28 and 30 by listing all factors of both numbers and picking the greatest common one, or by prime factorization. The GCF of 28 and 30 is 2.

See Also