Greatest Common Factor of 10, 90, 21, 91

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

• Greatest Common Factor of 10, 90, 21, 91 by common division method
• Greatest Common Factor of 10, 90, 21, 91 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 10

List of positive integer factors of 10 that divides 10 without a remainder.

1,2,5,10

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 21

List of positive integer factors of 21 that divides 21 without a remainder.

1,3,7,21

Factors of 91

List of positive integer factors of 91 that divides 91 without a remainder.

1,7,13,91

Greatest Common Factor

We found the factors 10,90,21,91 . The biggest common factor number is the GCF number.
So the greatest common factor 10,90,21,91 is 1.

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

• GCF of 88, 36, 66, 78
• GCF of 16, 58, 97, 71
• GCF of 16, 92, 64, 69
• GCF of 17, 30, 25, 79
• GCF of 71, 10, 23, 90

1. What is the GCF of 10, 90, 21, 91?

Answer: GCF of 10, 90, 21, 91 is 1.

2. How to Find the GCF of 10, 90, 21, 91

Answer: Greatest Common Factor(GCF) of 10, 90, 21, 91 = 1

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

Step 2: Then multiply all the prime factors GCF(10, 90, 21, 91) = 1.