Greatest Common Factor of 28, 21, 19, 144

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

• Greatest Common Factor of 28, 21, 19, 144 by common division method
• Greatest Common Factor of 28, 21, 19, 144 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 28

List of positive integer factors of 28 that divides 28 without a remainder.

1,2,4,7,14,28

Factors of 21

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

1,3,7,21

Factors of 19

List of positive integer factors of 19 that divides 19 without a remainder.

1,19

Factors of 144

List of positive integer factors of 144 that divides 144 without a remainder.

1,2,3,4,6,8,9,12,16,18,24,36,48,72,144

Greatest Common Factor

We found the factors 28,21,19,144 . The biggest common factor number is the GCF number.
So the greatest common factor 28,21,19,144 is 1.

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

• GCF of 59, 62, 46, 785
• GCF of 27, 56, 61, 124
• GCF of 41, 60, 95, 342
• GCF of 42, 29, 67, 866
• GCF of 40, 24, 62, 524

1. What is the GCF of 28, 21, 19, 144?

Answer: GCF of 28, 21, 19, 144 is 1.

2. How to Find the GCF of 28, 21, 19, 144

Answer: Greatest Common Factor(GCF) of 28, 21, 19, 144 = 1

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

Step 2: Then multiply all the prime factors GCF(28, 21, 19, 144) = 1.