Greatest Common Factor of 70, 21, 20, 145

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

• Greatest Common Factor of 70, 21, 20, 145 by common division method
• Greatest Common Factor of 70, 21, 20, 145 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 70

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

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

Factors of 21

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

1,3,7,21

Factors of 20

List of positive integer factors of 20 that divides 20 without a remainder.

1,2,4,5,10,20

Factors of 145

List of positive integer factors of 145 that divides 145 without a remainder.

1,5,29,145

Greatest Common Factor

We found the factors 70,21,20,145 . The biggest common factor number is the GCF number.
So the greatest common factor 70,21,20,145 is 1.

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

• GCF of 96, 81, 46, 958
• GCF of 80, 68, 37, 595
• GCF of 23, 46, 34, 304
• GCF of 54, 79, 36, 712
• GCF of 94, 61, 46, 175

1. What is the GCF of 70, 21, 20, 145?

Answer: GCF of 70, 21, 20, 145 is 1.

2. How to Find the GCF of 70, 21, 20, 145

Answer: Greatest Common Factor(GCF) of 70, 21, 20, 145 = 1

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

Step 2: Then multiply all the prime factors GCF(70, 21, 20, 145) = 1.