How to Find GCF of 21/17, 40/490, 161/143?

GCF of 21/17, 40/490, 161/143

Created By : Veerendra
Reviewed By : Phani Ponnapalli
Last Updated at : Mar 29,2023

Use our free GCF of Fractions Calculator tool to compute the GCF of 21/17, 40/490, 161/143 i.e 1/1191190 easily. The following is the detailed procedure to determine the greatest common factor of fractions 21/17, 40/490, 161/143.

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 21/17,40/490,161/143?

Given fractions are 21/17,40/490,161/143

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 21/17,40/490,161/143, numerators are 21,40,161

Denominators are 17,490,143

The GCF of 21,40,161 is 1 .

LCM of 17,490,143 is 1191190.

The greatest common factor of 21/17,40/490,161/143 = [GCF of 21,40,161]/[LCM of 17,490,143]= 1/1191190

Therefore, the GCF of 21/17,40/490,161/143 is 1/1191190.

Greatest Common Factor of 21,40,161

To find the highest common factor of 21,40,161, we have to find the factors of both numbers and list the highest common factor.

The factors of 21 are 1, 3, 7, 21

The factors of 40 are 1, 2, 4, 5, 8, 10, 20, 40

The factors of 161 are 1, 7, 23, 161

The HCF of 21,40,161 is 1.

Lets's calculate GCF of 21,40,161

Greatest Common Factor (GCF) of 21,40,161 By Common Division

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

Greatest Common Factor of 21,40,161 By Matching Biggest Common Factor Method

Now, list down the factors of 21

1,3,7,21

Now, list down the factors of 40

1,2,4,5,8,10,20,40

Now, list down the factors of 161

1,7,23,161

Greatest Common Factor

We found the factors 21,40,161 . The biggest common factor number is the GCF number.
So the greatest common factor 21,40,161 is 1.

Lets's calculate LCM of 17,490,143

Lowest Common Multiple of 17,490,143 using Common Division

Given numbers has no common factors except 1. So, there LCM is their product i.e 1191190

Thus GCF of Fractions = GCF of Numerators/LCM of Denominators = 1/1191190

Therefore, the GCF of Fractions 21/17,40/490,161/143 is 1/1191190

Least Common Multiple of 17,490,143 with GCF Formula

The formula of LCM is LCM(a₁,a₂,a₃....,a_n) = ( a₁ × a₂ × a₃ × .... × a_n) / GCF(a₁,a₂,a₃....,a_n) x common factors(if more than 2 numbers have common factors).

We need to calculate greatest common factor of 17,490,143 and common factors if more than two numbers have common factor, than apply into the LCM equation.

GCF(17,490,143) = 1

common factors(in case of two or more numbers have common factors) = 1

GCF(17,490,143) x common factors =1 x 1 = 1

LCM(17,490,143) = ( 17 × 490 × 143 ) / 1

LCM(17,490,143) = 1191190 / 1

LCM(17,490,143) = 1191190

GCF of Fractions Calculation Examples

Here are some samples of GCF of Fractions calculations.

FAQs on GCF of Fractions of 21/17, 40/490, 161/143

1. What is the HCF of 21,40,161?

The HCF of 21,40,161 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 21/17, 40/490, 161/143?

Answer: GCF of Numerators as per given numbers 21/17, 40/490, 161/143 is

GCF of Numerators i.e. for 21,40,161 is 1

LCM of denominators i.e. for 17,490,143 is 1191190.

Thus, GCF of Fractions is 1/1191190.Finally, GCF of Fractions for 21/17, 40/490, 161/143 is 1/1191190.