Greatest Common Factor of 78 and 80

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 78, 80 i.e. 2 largest integer by which both the numbers can be divided.

Greatest common factor (GCF) of 78 and 80 is 2.

GCF(78,80) = 2

GCF of 78 and 80

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

GCF of:
and

Greatest Common Factor of 78 and 80

GCF of 78 and 80 is 2

Prime Factorization of 78


2 78
3 39
13 13
1

Prime factors of 78 are 2,3,13. Prime factorization of 78 in exponential form is:

78 = 21×31×131

Prime Factorization of 80


2 80
2 40
2 20
2 10
5 5
1

Prime factors of 80 are 2,5. Prime factorization of 80 in exponential form is:

80 = 24×51

∴ So by taking common prime factors GCF of 78 and 80 is 2

Greatest Common Factor of 78 and 80 by matching factors method

Factors of 78

List of positive integer factors of 78 that divides 78 without a remainder.

1,2,3,6,13,26,39,78

Factors of 80

List of positive integer factors of 80 that divides 80 without a remainder.

1,2,4,5,8,10,16,20,40,80

Greatest Common Factor

We found the factors and prime factorization of 78 and 80. The biggest common factor number is the GCF number.
So the greatest common factor 78 and 80 is 2.

Also check out the Least Common Multiple of 78 and 80

Properties of GCF 78 and 80

(i) The GCF of 78 and 80 is associative

GCF of 78 and 80 = GCF of 80 and 78

Related Greatest Common Factor of 78

Related Greatest Common Factor of 80

Frequently Asked Questions on GCF of 78 and 80

1. What is the GCF of 78 and 80?

Answer: GCF of 78 and 80 is 2.

2. What are the Factors of 78?

Answer: Factors of 78 are 1, 2, 3, 6, 13, 26, 39, 78. There are 8 integers that are factors of 78. The greatest factor of 78 is 78.

3. What are the Factors of 80?

Answer: Factors of 80 are 1, 2, 4, 5, 8, 10, 16, 20, 40, 80. There are 10 integers that are factors of 80. The greatest factor of 80 is 80.

4. How to Find the GCF of 78 and 80?

Answer:

Greatest Common Factor of 78 and 80 = 2

Step 1: Find the prime factorization of 78

78 = 2 x 3 x 13

Step 2: Find the prime factorization of 80

80 = 2 x 2 x 2 x 2 x 5

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

GCF = 2

Step 4: Therefore, the greatest common factor of 78 and 80 is 2