Greatest Common Factor of 15, 20, 45, 55

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

• Greatest Common Factor of 15, 20, 45, 55 by common division method
• Greatest Common Factor of 15, 20, 45, 55 with matching the biggest common factor

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∴ So the GCF of the given numbers is 5 = 5

Factors of 15

List of positive integer factors of 15 that divides 15 without a remainder.

1,3,5,15

Factors of 20

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

1,2,4,5,10,20

Factors of 45

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

1,3,5,9,15,45

Factors of 55

List of positive integer factors of 55 that divides 55 without a remainder.

1,5,11,55

Greatest Common Factor

We found the factors 15,20,45,55 . The biggest common factor number is the GCF number.
So the greatest common factor 15,20,45,55 is 5.

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

• GCF of 23, 26, 92, 19
• GCF of 88, 82, 87, 56
• GCF of 20, 14, 82, 31
• GCF of 16, 20, 21, 36
• GCF of 36, 35, 36, 72

1. What is the GCF of 15, 20, 45, 55?

Answer: GCF of 15, 20, 45, 55 is 5.

2. How to Find the GCF of 15, 20, 45, 55

Answer: Greatest Common Factor(GCF) of 15, 20, 45, 55 = 5

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

Step 2: Then multiply all the prime factors GCF(15, 20, 45, 55) = 5.