GCF for 28 and 128

"Greatest Common Factor" Calculator

Greatest Common Factor of

and

What is the Greatest common Divisor of 28 and 128?

Answer: GCF of 28 and 128 is 4

(Four)

Finding GCF for 28 and 128 using all factors (divisors) listing

The first method to find GCF for numbers 28 and 128 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 128: 1, 2, 4, 8, 16, 32, 64, 128

So the Greatest Common Factor for 28 and 128 is 4

Finding GCF for 28 and 128 by Prime Factorization

The second method to find GCF for numbers 28 and 128 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 128: 2, 2, 2, 2, 2, 2, 2

As we can see there are Prime Factors common to both numbers: 2, 2

Now we need to multiply them to find GCF: 2 × 2 = 4

See Also

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 128? (The answer is: 4). Select the first number (e.g. '28') and the second number (e.g. '128'). 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
131281
141282
151281
1612816
171281
181282
191281
201284
211281
221282
231281
241288
251281
261282
271281
281284
291281
301282
311281
3212832
331281
341282
351281
361284
371281
381282
391281
401288
411281
421282

FAQ

What is the Greatest common Divisor of 28 and 128?

GCF of 28 and 128 is 4

See Also