Greatest Common Factor of 45, 90, 21, 64

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

• Greatest Common Factor of 45, 90, 21, 64 by common division method
• Greatest Common Factor of 45, 90, 21, 64 with matching the biggest common factor

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∴ GCF of numbers is 1 because of no common factors present between them.

Factors of 45

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

1,3,5,9,15,45

Factors of 90

List of positive integer factors of 90 that divides 90 without a remainder.

1,2,3,5,6,9,10,15,18,30,45,90

Factors of 21

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

1,3,7,21

Factors of 64

List of positive integer factors of 64 that divides 64 without a remainder.

1,2,4,8,16,32,64

Greatest Common Factor

We found the factors 45,90,21,64 . The biggest common factor number is the GCF number.
So the greatest common factor 45,90,21,64 is 1.

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

• GCF of 77, 93, 38, 25
• GCF of 27, 60, 73, 39
• GCF of 12, 53, 46, 44
• GCF of 70, 71, 92, 19
• GCF of 91, 15, 48, 37

1. What is the GCF of 45, 90, 21, 64?

Answer: GCF of 45, 90, 21, 64 is 1.

2. How to Find the GCF of 45, 90, 21, 64

Answer: Greatest Common Factor(GCF) of 45, 90, 21, 64 = 1

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

Step 2: Then multiply all the prime factors GCF(45, 90, 21, 64) = 1.