Greatest Common Factor of 6/21, 99/64, 72/40, 45/15

Created By : Jatin Gogia

Reviewed By : Rajasekhar Valipishetty

Last Updated : Apr 06, 2023

GCF of 6/21, 99/64, 72/40, 45/15

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 6/21,99/64,72/40,45/15

Given fractions are 6/21,99/64,72/40,45/15

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 6,99,72,45

Greatest Common Factor of Numerators i.e. GCF of 6,99,72,45 is 3 .

LCM of Denominators means LCM of 21,64,40,15 as per the given fractions.

LCM of 21,64,40,15 is 6720 as it is the smallest common factor for both these numbers.

Lets's calculate GCF of 6,99,72,45

GCF of Fractions 6/21,99/64,72/40,45/15 is 3/6720

3 6, 99, 72, 45
2, 33, 24, 15

∴ So the GCF of the given numbers is 3 = 3

Greatest Common Factor of 6,99,72,45 By Matching Biggest Common Factor Method

Greatest Common Factor of 6,99,72,45 By Matching Biggest Common Factor Method

Factors of 6

List of positive integer factors of 6 that divides 6 without a remainder.

1,2,3,6

Factors of 99

List of positive integer factors of 99 that divides 99 without a remainder.

1,3,9,11,33,99

Factors of 72

List of positive integer factors of 72 that divides 72 without a remainder.

1,2,3,4,6,8,9,12,18,24,36,72

Factors of 45

List of positive integer factors of 45 that divides 45 without a remainder.

1,3,5,9,15,45

Greatest Common Factor

We found the factors 6,99,72,45 . The biggest common factor number is the GCF number.
So the greatest common factor 6,99,72,45 is 3.

Lets's calculate LCM of 21,64,40,15

2 21, 64, 40, 15
2 21, 32, 20, 15
2 21, 16, 10, 15
3 21, 8, 5, 15
5 7, 8, 5, 5
7, 8, 1, 1

∴ So the LCM of the given numbers is 2 x 2 x 2 x 3 x 5 x 7 x 8 x 1 x 1 = 6720

Thus GCF of Fractions = GCF of Numerators/LCM of Denominators = 3/6720

Therefore, the GCF of Fractions 6/21,99/64,72/40,45/15 is 3/6720

Least Common Multiple of 21,64,40,15 with GCF Formula

Least Common Multiple of 21,64,40,15 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 21,64,40,15 and common factors if more than two numbers have common factor, than apply into the LCM equation.

GCF(21,64,40,15) = 1

common factors(in case of two or more numbers have common factors) = 120

GCF(21,64,40,15) x common factors =1 x 120 = 120

LCM(21,64,40,15) = ( 21 × 64 × 40 × 15 ) / 120

LCM(21,64,40,15) = 806400 / 120

LCM(21,64,40,15) = 6720


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 6/21, 99/64, 72/40, 45/15

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 6/21, 99/64, 72/40, 45/15?

Answer: GCF of Numerators as per given numbers 6/21, 99/64, 72/40, 45/15 is

GCF of Numerators i.e. for 6,99,72,45 is 3

LCM of denominators i.e. for 21,64,40,15 is 6720.

Thus, GCF of Fractions is 3/6720.Finally, GCF of Fractions for 6/21, 99/64, 72/40, 45/15 is 3/6720.