Greatest Common Factor of 21, 45, 420

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

• Greatest Common Factor of 21, 45, 420 by common division method
• Greatest Common Factor of 21, 45, 420 with matching the biggest common factor

Maximum 4 Number can be enter but you can reset

∴ 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 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 21,45,420 . The biggest common factor number is the GCF number.
So the greatest common factor 21,45,420 is 3.

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

• GCF of 67, 93, 244
• GCF of 99, 53, 814
• GCF of 16, 92, 832
• GCF of 33, 31, 343
• GCF of 37, 59, 818

1. What is the GCF of 21, 45, 420?

Answer: GCF of 21, 45, 420 is 3.

2. How to Find the GCF of 21, 45, 420

Answer: Greatest Common Factor(GCF) of 21, 45, 420 = 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, 420) = 3.