Greatest Common Factor of 30, 45, 18, 645

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

• Greatest Common Factor of 30, 45, 18, 645 by common division method
• Greatest Common Factor of 30, 45, 18, 645 with matching the biggest common factor

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∴ So the GCF of the given numbers is 3 = 3

Factors of 30

List of positive integer factors of 30 that divides 30 without a remainder.

1,2,3,5,6,10,15,30

Factors of 45

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

1,3,5,9,15,45

Factors of 18

List of positive integer factors of 18 that divides 18 without a remainder.

1,2,3,6,9,18

Factors of 645

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

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

Greatest Common Factor

We found the factors 30,45,18,645 . The biggest common factor number is the GCF number.
So the greatest common factor 30,45,18,645 is 3.

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

• GCF of 57, 60, 68, 883
• GCF of 43, 60, 71, 600
• GCF of 57, 24, 44, 616
• GCF of 77, 93, 48, 196
• GCF of 99, 11, 11, 967

1. What is the GCF of 30, 45, 18, 645?

Answer: GCF of 30, 45, 18, 645 is 3.

2. How to Find the GCF of 30, 45, 18, 645

Answer: Greatest Common Factor(GCF) of 30, 45, 18, 645 = 3

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

Step 2: Then multiply all the prime factors GCF(30, 45, 18, 645) = 3.