Greatest Common Factor of 21, 45, 64, 980

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

• Greatest Common Factor of 21, 45, 64, 980 by common division method
• Greatest Common Factor of 21, 45, 64, 980 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 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 64

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

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

Factors of 980

List of positive integer factors of 980 that divides 980 without a remainder.

1,2,4,5,7,10,14,20,28,35,49,70,98,140,196,245,490,980

Greatest Common Factor

We found the factors 21,45,64,980 . The biggest common factor number is the GCF number.
So the greatest common factor 21,45,64,980 is 1.

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

• GCF of 51, 81, 78, 107
• GCF of 91, 18, 26, 648
• GCF of 46, 80, 84, 949
• GCF of 62, 74, 87, 551
• GCF of 15, 21, 59, 393

1. What is the GCF of 21, 45, 64, 980?

Answer: GCF of 21, 45, 64, 980 is 1.

2. How to Find the GCF of 21, 45, 64, 980

Answer: Greatest Common Factor(GCF) of 21, 45, 64, 980 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 45, 64, 980) = 1.