Greatest Common Factor of 12/40, 20/45, 28/48, 36/90

Created By : Jatin Gogia

Reviewed By : Rajasekhar Valipishetty

Last Updated : Apr 06, 2023

GCF of 12/40, 20/45, 28/48, 36/90

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 12/40,20/45,28/48,36/90

Given fractions are 12/40,20/45,28/48,36/90

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 12,20,28,36

Greatest Common Factor of Numerators i.e. GCF of 12,20,28,36 is 4 .

LCM of Denominators means LCM of 40,45,48,90 as per the given fractions.

LCM of 40,45,48,90 is 720 as it is the smallest common factor for both these numbers.

Lets's calculate GCF of 12,20,28,36

GCF of Fractions 12/40,20/45,28/48,36/90 is 4/720

2 12, 20, 28, 36
2 6, 10, 14, 18
3, 5, 7, 9

∴ So the GCF of the given numbers is 2 x 2 = 4

Greatest Common Factor of 12,20,28,36 By Matching Biggest Common Factor Method

Greatest Common Factor of 12,20,28,36 By Matching Biggest Common Factor Method

Factors of 12

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

1,2,3,4,6,12

Factors of 20

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

1,2,4,5,10,20

Factors of 28

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

1,2,4,7,14,28

Factors of 36

List of positive integer factors of 36 that divides 36 without a remainder.

1,2,3,4,6,9,12,18,36

Greatest Common Factor

We found the factors 12,20,28,36 . The biggest common factor number is the GCF number.
So the greatest common factor 12,20,28,36 is 4.

Lets's calculate LCM of 40,45,48,90

2 40, 45, 48, 90
2 20, 45, 24, 45
2 10, 45, 12, 45
3 5, 45, 6, 45
3 5, 15, 2, 15
5 5, 5, 2, 5
1, 1, 2, 1

∴ So the LCM of the given numbers is 2 x 2 x 2 x 3 x 3 x 5 x 1 x 1 x 2 x 1 = 720

Thus GCF of Fractions = GCF of Numerators/LCM of Denominators = 4/720

Therefore, the GCF of Fractions 12/40,20/45,28/48,36/90 is 4/720

Least Common Multiple of 40,45,48,90 with GCF Formula

Least Common Multiple of 40,45,48,90 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 40,45,48,90 and common factors if more than two numbers have common factor, than apply into the LCM equation.

GCF(40,45,48,90) = 1

common factors(in case of two or more numbers have common factors) = 10800

GCF(40,45,48,90) x common factors =1 x 10800 = 10800

LCM(40,45,48,90) = ( 40 × 45 × 48 × 90 ) / 10800

LCM(40,45,48,90) = 7776000 / 10800

LCM(40,45,48,90) = 720


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 12/40, 20/45, 28/48, 36/90

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 12/40, 20/45, 28/48, 36/90?

Answer: GCF of Numerators as per given numbers 12/40, 20/45, 28/48, 36/90 is

GCF of Numerators i.e. for 12,20,28,36 is 4

LCM of denominators i.e. for 40,45,48,90 is 720.

Thus, GCF of Fractions is 4/720.Finally, GCF of Fractions for 12/40, 20/45, 28/48, 36/90 is 4/720.