GCF for 45 and 100

What is the Greatest common Divisor of 45 and 100?

Answer: GCF of 45 and 100 is 5

(Five)

Finding GCF for 45 and 100 using all factors (divisors) listing

The first method to find GCF for numbers 45 and 100 is to list all factors for both numbers and pick the highest common one:

All factors of 45: 1, 3, 5, 9, 15, 45

All factors of 100: 1, 2, 4, 5, 10, 20, 25, 50, 100

So the Greatest Common Factor for 45 and 100 is 5

Finding GCF for 45 and 100 by Prime Factorization

The second method to find GCF for numbers 45 and 100 is to list all Prime Factors for both numbers and multiply the common ones:

All Prime Factors of 45: 3, 3, 5

All Prime Factors of 100: 2, 2, 5, 5

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 45 and 100

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 Divisor of 45 and 100? (The answer is: 5). Select the first number (e.g. '45') and the second number (e.g. '100'). 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

GCF Table

Number 1Number 2GCF
30100
311001
32100
331001
341002
35100
36100
371001
381002
391001
40100
41100
42100
431001
44100
45100
461002
47100
48100
49100
50100
511001
521004
531001
541002
55100
56100
571001
581002
591001

FAQ

What is the Greatest common Divisor of 45 and 100?

GCF of 45 and 100 is 5