Greatest Common Factor of 78/7, 20/9

Created By : Jatin Gogia

Reviewed By : Rajasekhar Valipishetty

Last Updated : Apr 06, 2023

GCF of 78/7, 20/9

Enter two or more fractions separated by "commas"

Ex: 2/3, 5/7 or 3/5, 5/9, 7/3

GCF of:

Greatest Common Factor of 78/7,20/9

Given fractions are 78/7,20/9

Formula to find GCF of Fractions is

GCF = GCF of Numerators/LCM of Denominators

As per the formula GCF of Fractions let’s split into two parts and find the GCF of Numerators and LCM of Denominators

In the given fractions GCF of Numerators means GCF of 78,20

Greatest Common Factor of Numerators i.e. GCF of 78,20 is 2 .

LCM of Denominators means LCM of 7,9 as per the given fractions.

LCM of 7,9 is 63 as it is the smallest common factor for both these numbers.

Lets's calculate GCF of 78,20

GCF of Fractions 78/7,20/9 is 2/63

2 78, 20
39, 10

∴ So the GCF of the given numbers is 2 = 2

Greatest Common Factor of 78,20 By Matching Biggest Common Factor Method

Greatest Common Factor of 78,20 By Matching Biggest Common Factor 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 20

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

1,2,4,5,10,20

Greatest Common Factor

We found the factors 78,20 . The biggest common factor number is the GCF number.
So the greatest common factor 78,20 is 2.

Lets's calculate LCM of 7,9

Given numbers has no common factors except 1. So, there LCM is their product i.e 63

Thus GCF of Fractions = GCF of Numerators/LCM of Denominators = 2/63

Therefore, the GCF of Fractions 78/7,20/9 is 2/63

Least Common Multiple of 7,9 with GCF Formula

Least Common Multiple of 7,9 with GCF Formula

The formula of LCM is LCM(a1,a2,a3....,an) = ( a1 × a2 × a3 × .... × an) / GCF(a1,a2,a3....,an) x common factors(if more than 2 numbers have common factors).

We need to calculate greatest common factor of 7,9 and common factors if more than two numbers have common factor, than apply into the LCM equation.

GCF(7,9) = 1

common factors(in case of two or more numbers have common factors) = 1

GCF(7,9) x common factors =1 x 1 = 1

LCM(7,9) = ( 7 × 9 ) / 1

LCM(7,9) = 63 / 1

LCM(7,9) = 63


GCF of Fractions Calculation Examples

Here are some samples of GCF of Fractions calculations.

GCF of Fractions Calculation Examples

Here are some samples of GCF of Fractions calculations.

Frequently Asked Questions on Fractional GCF of 78/7, 20/9

1. How to find GCF in Fractions?

Answer: GCF of fractions can be found using the simple formula GCF of Fractions = GCF of Numerators/LCM of Denominators.

2. What is the GCF of Fractions for 78/7, 20/9?

Answer: GCF of Numerators as per given numbers 78/7, 20/9 is

GCF of Numerators i.e. for 78,20 is 2

LCM of denominators i.e. for 7,9 is 63.

Thus, GCF of Fractions is 2/63.Finally, GCF of Fractions for 78/7, 20/9 is 2/63.