GCF for 40 and 205

What is the Greatest Common Factor of 40 and 205?

Answer: GCF of 40 and 205 is 5

(Five)

Finding GCF for 40 and 205 using all factors (divisors) listing

The first method to find GCF for numbers 40 and 205 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 205: 1, 5, 41, 205

So the Greatest Common Factor for 40 and 205 is 5

Finding GCF for 40 and 205 by Prime Factorization

The second method to find GCF for numbers 40 and 205 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 205: 5, 41

As we can see there is only one Prime Factor common to both numbers. It is 5

So 5 is the Greatest Common Factor of 40 and 205

GCF Table

Number 1Number 2GCF
25205
262051
272051
282051
292051
302055
312051
322051
332051
342051
352055
362051
372051
382051
392051
402055
4120541
422051
432051
442051
452055
462051
472051
482051
492051
502055
512051
522051
532051
542051

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 205? (The answer is: 5). Select the first number (e.g. '40') and the second number (e.g. '205'). 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 205?

GCF of 40 and 205 is 5