Greatest Common Factor of 42 and 55

Created By : Jatin Gogia

Reviewed By : Rajasekhar Valipishetty

Last Updated : Apr 06, 2023


Make use of GCF Calculator to quickly find the Greatest Common Factor of numbers 42, 55 i.e. 1 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 42 and 55 is 1.

GCF(42,55) = 1

GCF of 42 and 55

Greatest common factor or Greatest common divisor (GCD) can be calculated in following way;

GCF of:
and

Greatest Common Factor of 42 and 55

GCF of 42 and 55 is 1

Prime Factorization of 42


2 42
3 21
7 7
1

Prime factors of 42 are 2,3,7. Prime factorization of 42 in exponential form is:

42 = 21×31×71

Prime Factorization of 55


5 55
11 11
1

Prime factors of 55 are 5,11. Prime factorization of 55 in exponential form is:

55 = 51×111

∴ So by taking common prime factors GCF of 42 and 55 is 1

Greatest Common Factor of 42 and 55 by matching factors method

Factors of 42

List of positive integer factors of 42 that divides 42 without a remainder.

1,2,3,6,7,14,21,42

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 and prime factorization of 42 and 55. The biggest common factor number is the GCF number.
So the greatest common factor 42 and 55 is 1.

Also check out the Least Common Multiple of 42 and 55

Properties of GCF 42 and 55

(i) The GCF of 42 and 55 is associative

GCF of 42 and 55 = GCF of 55 and 42

Frequently Asked Questions on GCF of 42 and 55

1. What is the GCF of 42 and 55?

Answer: GCF of 42 and 55 is 1.

2. What are the Factors of 42?

Answer: Factors of 42 are 1, 2, 3, 6, 7, 14, 21, 42. There are 8 integers that are factors of 42. The greatest factor of 42 is 42.

3. What are the Factors of 55?

Answer: Factors of 55 are 1, 5, 11, 55. There are 4 integers that are factors of 55. The greatest factor of 55 is 55.

4. How to Find the GCF of 42 and 55?

Answer:

Greatest Common Factor of 42 and 55 = 1

Step 1: Find the prime factorization of 42

42 = 2 x 3 x 7

Step 2: Find the prime factorization of 55

55 = 5 x 11

Step 3: Multiply those factors both numbers have in common in steps i) or ii) above to find the gcf:

GCF = = 1

Step 4: Therefore, the greatest common factor of 42 and 55 is 1