Greatest Common Factor of 21, 78, 49

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

• Greatest Common Factor of 21, 78, 49 by common division method
• Greatest Common Factor of 21, 78, 49 with matching the biggest common factor

Maximum 4 Number can be enter but you can reset

∴ 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 78

List of positive integer factors of 78 that divides 78 without a remainder.

1,2,3,6,13,26,39,78

Factors of 49

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

1,7,49

Greatest Common Factor

We found the factors 21,78,49 . The biggest common factor number is the GCF number.
So the greatest common factor 21,78,49 is 1.

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

• GCF of 51, 47, 61
• GCF of 92, 37, 29
• GCF of 19, 21, 95
• GCF of 13, 26, 79
• GCF of 71, 54, 68

1. What is the GCF of 21, 78, 49?

Answer: GCF of 21, 78, 49 is 1.

2. How to Find the GCF of 21, 78, 49

Answer: Greatest Common Factor(GCF) of 21, 78, 49 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 78, 49) = 1.