Greatest Common Factor of 645, 688, 420

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

• Greatest Common Factor of 645, 688, 420 by common division method
• Greatest Common Factor of 645, 688, 420 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 645

List of positive integer factors of 645 that divides 645 without a remainder.

1,3,5,15,43,129,215,645

Factors of 688

List of positive integer factors of 688 that divides 688 without a remainder.

1,2,4,8,16,43,86,172,344,688

Factors of 420

List of positive integer factors of 420 that divides 420 without a remainder.

1,2,3,4,5,6,7,10,12,14,15,20,21,28,30,35,42,60,70,84,105,140,210,420

Greatest Common Factor

We found the factors 645,688,420 . The biggest common factor number is the GCF number.
So the greatest common factor 645,688,420 is 1.

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

• GCF of 633, 340, 934
• GCF of 787, 976, 509
• GCF of 162, 383, 471
• GCF of 717, 732, 799
• GCF of 342, 555, 206

1. What is the GCF of 645, 688, 420?

Answer: GCF of 645, 688, 420 is 1.

2. How to Find the GCF of 645, 688, 420

Answer: Greatest Common Factor(GCF) of 645, 688, 420 = 1

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

Step 2: Then multiply all the prime factors GCF(645, 688, 420) = 1.