GCF of 13/85, 72/45, 68/81, 39/17
Reviewed By : Phani Ponnapalli
Last Updated at : Mar 29,2023
Use our free GCF of Fractions Calculator tool to compute the GCF of 13/85, 72/45, 68/81, 39/17 i.e 1/6885 easily. The following is the detailed procedure to determine the greatest common factor of fractions 13/85, 72/45, 68/81, 39/17.
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 13/85,72/45,68/81,39/17?
Given fractions are 13/85,72/45,68/81,39/17
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 13/85,72/45,68/81,39/17, numerators are 13,72,68,39
Denominators are 85,45,81,17
The GCF of 13,72,68,39 is 1 .
LCM of 85,45,81,17 is 6885.
The greatest common factor of 13/85,72/45,68/81,39/17 = [GCF of 13,72,68,39]/[LCM of 85,45,81,17]= 1/6885
Therefore, the GCF of 13/85,72/45,68/81,39/17 is 1/6885.
To find the highest common factor of 13,72,68,39, we have to find the factors of both numbers and list the highest common factor.
The factors of 13 are 1, 13
The factors of 72 are 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72
The factors of 68 are 1, 2, 4, 17, 34, 68
The factors of 39 are 1, 3, 13, 39
The HCF of 13,72,68,39 is 1.
Lets's calculate GCF of 13,72,68,39
∴ So GCF of numbers is 1 because of no common factors present between them.
Greatest Common Factor of 13,72,68,39 By Matching Biggest Common Factor Method
Now, list down the factors of 13
:1,13
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 68
:1,2,4,17,34,68
Now, list down the factors of 39
:1,3,13,39
Greatest Common Factor
We found the factors 13,72,68,39 . The biggest common factor number is the GCF number.
So the greatest common factor 13,72,68,39 is 1.
Lets's calculate LCM of 85,45,81,17
| 3 | 85, 45, 81, 17 |
| 3 | 85, 15, 27, 17 |
| 5 | 85, 5, 9, 17 |
| 17 | 17, 1, 9, 17 |
| 1, 1, 9, 1 |
∴ So the LCM of the given numbers is 3 x 3 x 5 x 17 x 1 x 1 x 9 x 1 = 6885
Thus GCF of Fractions = GCF of Numerators/LCM of Denominators = 1/6885
Therefore, the GCF of Fractions 13/85,72/45,68/81,39/17 is 1/6885
Least Common Multiple of 85,45,81,17 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 85,45,81,17 and common factors if more than two numbers have common factor, than apply into the LCM equation.
GCF(85,45,81,17) = 1
common factors(in case of two or more numbers have common factors) = 765
GCF(85,45,81,17) x common factors =1 x 765 = 765
LCM(85,45,81,17) = ( 85 × 45 × 81 × 17 ) / 765
LCM(85,45,81,17) = 5267025 / 765
LCM(85,45,81,17) = 6885
GCF of Fractions Calculation Examples
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FAQs on GCF of Fractions of 13/85, 72/45, 68/81, 39/17
1. What is the HCF of 13,72,68,39?
The HCF of 13,72,68,39 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 13/85, 72/45, 68/81, 39/17?
Answer: GCF of Numerators as per given numbers 13/85, 72/45, 68/81, 39/17 is
GCF of Numerators i.e. for 13,72,68,39 is 1
LCM of denominators i.e. for 85,45,81,17 is 6885.
Thus, GCF of Fractions is 1/6885.Finally, GCF of Fractions for 13/85, 72/45, 68/81, 39/17 is 1/6885.