Greatest Common Factor of 21, 49, 420

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

• Greatest Common Factor of 21, 49, 420 by common division method
• Greatest Common Factor of 21, 49, 420 with matching the biggest common factor

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∴ So the GCF of the given numbers is 7 = 7

Factors of 21

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

1,3,7,21

Factors of 49

List of positive integer factors of 49 that divides 49 without a remainder.

1,7,49

Factors of 420

List of positive integer factors of 420 that divides 420 without a remainder.

1,2,3,4,5,6,7,10,12,14,15,20,21,28,30,35,42,60,70,84,105,140,210,420

Greatest Common Factor

We found the factors 21,49,420 . The biggest common factor number is the GCF number.
So the greatest common factor 21,49,420 is 7.

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

• GCF of 67, 35, 729
• GCF of 70, 36, 280
• GCF of 75, 80, 774
• GCF of 96, 75, 141
• GCF of 42, 50, 703

1. What is the GCF of 21, 49, 420?

Answer: GCF of 21, 49, 420 is 7.

2. How to Find the GCF of 21, 49, 420

Answer: Greatest Common Factor(GCF) of 21, 49, 420 = 7

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

Step 2: Then multiply all the prime factors GCF(21, 49, 420) = 7.