GCF for 40 and 770

What is the Greatest Common Factor of 40 and 770?

Answer: GCF of 40 and 770 is 10

(Ten)

Finding GCF for 40 and 770 using all factors (divisors) listing

The first method to find GCF for numbers 40 and 770 is to list all factors for both numbers and pick the highest common one:

All factors of 40: 1, 2, 4, 5, 8, 10, 20, 40

All factors of 770: 1, 2, 5, 7, 10, 11, 14, 22, 35, 55, 70, 77, 110, 154, 385, 770

So the Greatest Common Factor for 40 and 770 is 10

Finding GCF for 40 and 770 by Prime Factorization

The second method to find GCF for numbers 40 and 770 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 40: 2, 2, 2, 5

All Prime Factors of 770: 2, 5, 7, 11

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
257705
267702
277701
2877014
297701
3077010
317701
327702
3377011
347702
3577035
367702
377701
387702
397701
4077010
417701
4277014
437701
4477022
457705
467702
477701
487702
497707
5077010
517701
527702
537701
547702

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 40 and 770? (The answer is: 10). Select the first number (e.g. '40') and the second number (e.g. '770'). 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 40 and 770?

GCF of 40 and 770 is 10