Greatest Common Factor of 31/72, 87/24, 28/64, 12/20

Created By : Jatin Gogia

Reviewed By : Rajasekhar Valipishetty

Last Updated : Apr 06, 2023

GCF of 31/72, 87/24, 28/64, 12/20

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 31/72,87/24,28/64,12/20

Given fractions are 31/72,87/24,28/64,12/20

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 31,87,28,12

Greatest Common Factor of Numerators i.e. GCF of 31,87,28,12 is 1 .

LCM of Denominators means LCM of 72,24,64,20 as per the given fractions.

LCM of 72,24,64,20 is 2880 as it is the smallest common factor for both these numbers.

Lets's calculate GCF of 31,87,28,12

GCF of Fractions 31/72,87/24,28/64,12/20 is 1/2880

∴ So GCF of numbers is 1 because of no common factors present between them.

Greatest Common Factor of 31,87,28,12 By Matching Biggest Common Factor Method

Greatest Common Factor of 31,87,28,12 By Matching Biggest Common Factor Method

Factors of 31

List of positive integer factors of 31 that divides 31 without a remainder.

1,31

Factors of 87

List of positive integer factors of 87 that divides 87 without a remainder.

1,3,29,87

Factors of 28

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

1,2,4,7,14,28

Factors of 12

List of positive integer factors of 12 that divides 12 without a remainder.

1,2,3,4,6,12

Greatest Common Factor

We found the factors 31,87,28,12 . The biggest common factor number is the GCF number.
So the greatest common factor 31,87,28,12 is 1.

Lets's calculate LCM of 72,24,64,20

2 72, 24, 64, 20
2 36, 12, 32, 10
2 18, 6, 16, 5
3 9, 3, 8, 5
1, 3, 8, 5

∴ So the LCM of the given numbers is 2 x 2 x 2 x 3 x 1 x 3 x 8 x 5 = 2880

Thus GCF of Fractions = GCF of Numerators/LCM of Denominators = 1/2880

Therefore, the GCF of Fractions 31/72,87/24,28/64,12/20 is 1/2880

Least Common Multiple of 72,24,64,20 with GCF Formula

Least Common Multiple of 72,24,64,20 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 72,24,64,20 and common factors if more than two numbers have common factor, than apply into the LCM equation.

GCF(72,24,64,20) = 4

common factors(in case of two or more numbers have common factors) = 192

GCF(72,24,64,20) x common factors =4 x 192 = 768

LCM(72,24,64,20) = ( 72 × 24 × 64 × 20 ) / 768

LCM(72,24,64,20) = 2211840 / 768

LCM(72,24,64,20) = 2880


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 31/72, 87/24, 28/64, 12/20

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 31/72, 87/24, 28/64, 12/20?

Answer: GCF of Numerators as per given numbers 31/72, 87/24, 28/64, 12/20 is

GCF of Numerators i.e. for 31,87,28,12 is 1

LCM of denominators i.e. for 72,24,64,20 is 2880.

Thus, GCF of Fractions is 1/2880.Finally, GCF of Fractions for 31/72, 87/24, 28/64, 12/20 is 1/2880.