Greatest Common Factor of 21, 22, 78, 155

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

• Greatest Common Factor of 21, 22, 78, 155 by common division method
• Greatest Common Factor of 21, 22, 78, 155 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 22

List of positive integer factors of 22 that divides 22 without a remainder.

1,2,11,22

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 155

List of positive integer factors of 155 that divides 155 without a remainder.

1,5,31,155

Greatest Common Factor

We found the factors 21,22,78,155 . The biggest common factor number is the GCF number.
So the greatest common factor 21,22,78,155 is 1.

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

• GCF of 19, 76, 64, 189
• GCF of 23, 26, 32, 477
• GCF of 17, 15, 90, 336
• GCF of 67, 27, 92, 230
• GCF of 40, 51, 12, 611

1. What is the GCF of 21, 22, 78, 155?

Answer: GCF of 21, 22, 78, 155 is 1.

2. How to Find the GCF of 21, 22, 78, 155

Answer: Greatest Common Factor(GCF) of 21, 22, 78, 155 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 22, 78, 155) = 1.