GCF for 45 and 72
"Greatest Common Factor" Calculator
What is the Greatest common Divisor of 45 and 72?
Answer: GCF of 45 and 72 is 9
(Nine)
Finding GCF for 45 and 72 using all factors (divisors) listing
The first method to find GCF for numbers 45 and 72 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 72: 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
So the Greatest Common Factor for 45 and 72 is 9
Finding GCF for 45 and 72 by Prime Factorization
The second method to find GCF for numbers 45 and 72 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 72: 2, 2, 2, 3, 3
As we can see there are Prime Factors common to both numbers: 3, 3
Now we need to multiply them to find GCF: 3 × 3 = 9
Related Calculations
See Also
- Least Common Multiple - Find the Least Common Multiple (LCM) of two numbers
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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 72? (The answer is: 9). Select the first number (e.g. '45') and the second number (e.g. '72'). 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