GCF for 40 and 670

What is the Greatest Common Factor of 40 and 670?

Answer: GCF of 40 and 670 is 10

(Ten)

Finding GCF for 40 and 670 using all factors (divisors) listing

The first method to find GCF for numbers 40 and 670 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 670: 1, 2, 5, 10, 67, 134, 335, 670

So the Greatest Common Factor for 40 and 670 is 10

Finding GCF for 40 and 670 by Prime Factorization

The second method to find GCF for numbers 40 and 670 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 670: 2, 5, 67

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
256705
266702
276701
286702
296701
3067010
316701
326702
336701
346702
356705
366702
376701
386702
396701
4067010
416701
426702
436701
446702
456705
466702
476701
486702
496701
5067010
516701
526702
536701
546702

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 670? (The answer is: 10). Select the first number (e.g. '40') and the second number (e.g. '670'). 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 670?

GCF of 40 and 670 is 10