Greatest Common Factor of 21, 45, 120

Greatest common factor or Greatest common divisor (GCD) can be calculated in two ways

• Greatest Common Factor of 21, 45, 120 by common division method
• Greatest Common Factor of 21, 45, 120 with matching the biggest common factor

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∴ So the GCF of the given numbers is 3 = 3

Factors of 21

List of positive integer factors of 21 that divides 21 without a remainder.

1,3,7,21

Factors of 45

List of positive integer factors of 45 that divides 45 without a remainder.

1,3,5,9,15,45

Factors of 120

List of positive integer factors of 120 that divides 120 without a remainder.

1,2,3,4,5,6,8,10,12,15,20,24,30,40,60,120

Greatest Common Factor

We found the factors 21,45,120 . The biggest common factor number is the GCF number.
So the greatest common factor 21,45,120 is 3.

Here are some samples of GCF of two or more Numbers calculations.

• GCF of 74, 87, 621
• GCF of 74, 55, 969
• GCF of 85, 42, 913
• GCF of 35, 26, 472
• GCF of 55, 17, 272

1. What is the GCF of 21, 45, 120?

Answer: GCF of 21, 45, 120 is 3.

2. How to Find the GCF of 21, 45, 120

Answer: Greatest Common Factor(GCF) of 21, 45, 120 = 3

Step 1: Divide all the numbers with common prime numbers having remainder zero.

Step 2: Then multiply all the prime factors GCF(21, 45, 120) = 3.