GCF of 72/45, 81/20, 43/18, 64/19
Reviewed By : Phani Ponnapalli
Last Updated at : Mar 29,2023
Use our free GCF of Fractions Calculator tool to compute the GCF of 72/45, 81/20, 43/18, 64/19 i.e 1/3420 easily. The following is the detailed procedure to determine the greatest common factor of fractions 72/45, 81/20, 43/18, 64/19.
Enter two or more fractions separated by "commas"
Ex: 2/3, 5/7 or 3/5, 5/9, 7/3
What is the GCF of 72/45,81/20,43/18,64/19?
Given fractions are 72/45,81/20,43/18,64/19
To find the GCF of fractions, we have to find the GCF of numerator numbers and LCM of denominator numbers. Its formula is given by
GCF of Fraction = Greatest Common Factor of Numerator/Least Common Multiple of Denominators
In the fractions 72/45,81/20,43/18,64/19, numerators are 72,81,43,64
Denominators are 45,20,18,19
The GCF of 72,81,43,64 is 1 .
LCM of 45,20,18,19 is 3420.
The greatest common factor of 72/45,81/20,43/18,64/19 = [GCF of 72,81,43,64]/[LCM of 45,20,18,19]= 1/3420
Therefore, the GCF of 72/45,81/20,43/18,64/19 is 1/3420.
To find the highest common factor of 72,81,43,64, we have to find the factors of both numbers and list the highest common factor.
The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
The factors of 81 are 1, 3, 9, 27, 81
The factors of 43 are 1, 43
The factors of 64 are 1, 2, 4, 8, 16, 32, 64
The HCF of 72,81,43,64 is 1.
Lets's calculate GCF of 72,81,43,64
∴ So GCF of numbers is 1 because of no common factors present between them.
Greatest Common Factor of 72,81,43,64 By Matching Biggest Common Factor Method
Now, list down the factors of 72
:1,2,3,4,6,8,9,12,18,24,36,72
Now, list down the factors of 81
:1,3,9,27,81
Now, list down the factors of 43
:1,43
Now, list down the factors of 64
:1,2,4,8,16,32,64
Greatest Common Factor
We found the factors 72,81,43,64 . The biggest common factor number is the GCF number.
So the greatest common factor 72,81,43,64 is 1.
Lets's calculate LCM of 45,20,18,19
| 2 | 45, 20, 18, 19 |
| 3 | 45, 10, 9, 19 |
| 3 | 15, 10, 3, 19 |
| 5 | 5, 10, 1, 19 |
| 1, 2, 1, 19 |
∴ So the LCM of the given numbers is 2 x 3 x 3 x 5 x 1 x 2 x 1 x 19 = 3420
Thus GCF of Fractions = GCF of Numerators/LCM of Denominators = 1/3420
Therefore, the GCF of Fractions 72/45,81/20,43/18,64/19 is 1/3420
Least Common Multiple of 45,20,18,19 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 45,20,18,19 and common factors if more than two numbers have common factor, than apply into the LCM equation.
GCF(45,20,18,19) = 1
common factors(in case of two or more numbers have common factors) = 90
GCF(45,20,18,19) x common factors =1 x 90 = 90
LCM(45,20,18,19) = ( 45 × 20 × 18 × 19 ) / 90
LCM(45,20,18,19) = 307800 / 90
LCM(45,20,18,19) = 3420
GCF of Fractions Calculation Examples
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FAQs on GCF of Fractions of 72/45, 81/20, 43/18, 64/19
1. What is the HCF of 72,81,43,64?
The HCF of 72,81,43,64 is 1
2. What is the GCF of a fraction?
The GCF of a fraction is defined as the greatest fraction that divides exactly into 2 or more fractions.
3. 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.
4. What is the GCF of Fractions for 72/45, 81/20, 43/18, 64/19?
Answer: GCF of Numerators as per given numbers 72/45, 81/20, 43/18, 64/19 is
GCF of Numerators i.e. for 72,81,43,64 is 1
LCM of denominators i.e. for 45,20,18,19 is 3420.
Thus, GCF of Fractions is 1/3420.Finally, GCF of Fractions for 72/45, 81/20, 43/18, 64/19 is 1/3420.