GCF for 20 and 210

What is the Greatest Common Factor of 20 and 210?

Answer: GCF of 20 and 210 is 10

(Ten)

Finding GCF for 20 and 210 using all factors (divisors) listing

The first method to find GCF for numbers 20 and 210 is to list all factors for both numbers and pick the highest common one:

All factors of 20: 1, 2, 4, 5, 10, 20

All factors of 210: 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, 210

So the Greatest Common Factor for 20 and 210 is 10

Finding GCF for 20 and 210 by Prime Factorization

The second method to find GCF for numbers 20 and 210 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 20: 2, 2, 5

All Prime Factors of 210: 2, 3, 5, 7

As we can see there are Prime Factors common to both numbers: 2, 5

Now we need to multiply them to find GCF: 2 × 5 = 10

GCF Table

Number 1Number 2GCF
52105
62106
72107
82102
92103
1021010
112101
122106
132101
1421014
1521015
162102
172101
182106
192101
2021010
2121021
222102
232101
242106
252105
262102
272103
2821014
292101
3021030
312101
322102
332103
342102

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 20 and 210? (The answer is: 10). Select the first number (e.g. '20') and the second number (e.g. '210'). 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 20 and 210?

GCF of 20 and 210 is 10