Greatest Common Factor of 21, 78, 90, 800

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

• Greatest Common Factor of 21, 78, 90, 800 by common division method
• Greatest Common Factor of 21, 78, 90, 800 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 78

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

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

Factors of 90

List of positive integer factors of 90 that divides 90 without a remainder.

1,2,3,5,6,9,10,15,18,30,45,90

Factors of 800

List of positive integer factors of 800 that divides 800 without a remainder.

1,2,4,5,8,10,16,20,25,32,40,50,80,100,160,200,400,800

Greatest Common Factor

We found the factors 21,78,90,800 . The biggest common factor number is the GCF number.
So the greatest common factor 21,78,90,800 is 1.

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

• GCF of 90, 91, 67, 290
• GCF of 51, 58, 27, 198
• GCF of 56, 59, 14, 181
• GCF of 53, 86, 35, 826
• GCF of 16, 37, 51, 118

1. What is the GCF of 21, 78, 90, 800?

Answer: GCF of 21, 78, 90, 800 is 1.

2. How to Find the GCF of 21, 78, 90, 800

Answer: Greatest Common Factor(GCF) of 21, 78, 90, 800 = 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, 90, 800) = 1.