Greatest Common Factor of 90, 70, 45, 21

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

• Greatest Common Factor of 90, 70, 45, 21 by common division method
• Greatest Common Factor of 90, 70, 45, 21 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 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 70

List of positive integer factors of 70 that divides 70 without a remainder.

1,2,5,7,10,14,35,70

Factors of 45

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

1,3,5,9,15,45

Factors of 21

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

1,3,7,21

Greatest Common Factor

We found the factors 90,70,45,21 . The biggest common factor number is the GCF number.
So the greatest common factor 90,70,45,21 is 1.

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

• GCF of 78, 41, 66, 78
• GCF of 81, 42, 69, 21
• GCF of 99, 12, 68, 60
• GCF of 46, 23, 93, 82
• GCF of 32, 98, 69, 85

1. What is the GCF of 90, 70, 45, 21?

Answer: GCF of 90, 70, 45, 21 is 1.

2. How to Find the GCF of 90, 70, 45, 21

Answer: Greatest Common Factor(GCF) of 90, 70, 45, 21 = 1

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

Step 2: Then multiply all the prime factors GCF(90, 70, 45, 21) = 1.