Greatest Common Factor of 21, 72, 45, 249

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

• Greatest Common Factor of 21, 72, 45, 249 by common division method
• Greatest Common Factor of 21, 72, 45, 249 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 72

List of positive integer factors of 72 that divides 72 without a remainder.

1,2,3,4,6,8,9,12,18,24,36,72

Factors of 45

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

1,3,5,9,15,45

Factors of 249

List of positive integer factors of 249 that divides 249 without a remainder.

1,3,83,249

Greatest Common Factor

We found the factors 21,72,45,249 . The biggest common factor number is the GCF number.
So the greatest common factor 21,72,45,249 is 3.

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

• GCF of 34, 99, 80, 940
• GCF of 27, 24, 17, 784
• GCF of 43, 20, 88, 489
• GCF of 64, 13, 19, 897
• GCF of 67, 15, 96, 975

1. What is the GCF of 21, 72, 45, 249?

Answer: GCF of 21, 72, 45, 249 is 3.

2. How to Find the GCF of 21, 72, 45, 249

Answer: Greatest Common Factor(GCF) of 21, 72, 45, 249 = 3

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

Step 2: Then multiply all the prime factors GCF(21, 72, 45, 249) = 3.