Greatest Common Factor of 21, 45, 155

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

• Greatest Common Factor of 21, 45, 155 by common division method
• Greatest Common Factor of 21, 45, 155 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 21

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

1,3,7,21

Factors of 45

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

1,3,5,9,15,45

Factors of 155

List of positive integer factors of 155 that divides 155 without a remainder.

1,5,31,155

Greatest Common Factor

We found the factors 21,45,155 . The biggest common factor number is the GCF number.
So the greatest common factor 21,45,155 is 1.

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

• GCF of 85, 44, 327
• GCF of 68, 93, 195
• GCF of 41, 65, 671
• GCF of 60, 77, 555
• GCF of 45, 85, 676

1. What is the GCF of 21, 45, 155?

Answer: GCF of 21, 45, 155 is 1.

2. How to Find the GCF of 21, 45, 155

Answer: Greatest Common Factor(GCF) of 21, 45, 155 = 1

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

Step 2: Then multiply all the prime factors GCF(21, 45, 155) = 1.