GCF for 70 and 170

What is the Greatest Common Factor of 70 and 170?

Answer: GCF of 70 and 170 is 10

(Ten)

Finding GCF for 70 and 170 using all factors (divisors) listing

The first method to find GCF for numbers 70 and 170 is to list all factors for both numbers and pick the highest common one:

All factors of 70: 1, 2, 5, 7, 10, 14, 35, 70

All factors of 170: 1, 2, 5, 10, 17, 34, 85, 170

So the Greatest Common Factor for 70 and 170 is 10

Finding GCF for 70 and 170 by Prime Factorization

The second method to find GCF for numbers 70 and 170 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 70: 2, 5, 7

All Prime Factors of 170: 2, 5, 17

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
551705
561702
571701
581702
591701
6017010
611701
621702
631701
641702
651705
661702
671701
6817034
691701
7017010
711701
721702
731701
741702
751705
761702
771701
781702
791701
8017010
811701
821702
831701
841702

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 70 and 170? (The answer is: 10). Select the first number (e.g. '70') and the second number (e.g. '170'). 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 70 and 170?

GCF of 70 and 170 is 10