4/7 - 9/20 as a fraction

Learn how to find what is 4/7 minus 9/20 in fraction form just in a few minutes. We have covered the easiest method to write 4/7 - 9/20 as a fraction and decimal.

Summary: 4/7 minus 9/20 = 17/140
Since both fractions have unequal denominators, 4/7 minus 9/20 is an unlike fractions subtraction. For subtracting unlike fractions, you have to first find the equivalent fractions for fraction 4/7 and fraction 9/20 in order to have the same denominators for both fractions. Therefore, you have to find the LCM of denominators 7 and 20. 140 is the LCM of 7 and 20. Multiplying the LCM 140 with the numerators and denominators of both fractions (4/7 x 140/140) - (9/20 x 140/140), and simplify further in order to have the common denominator. So the equivalent fraction for 4/7 is 80/140 and for 9/20 is 63/140. By simplifying this fraction subtraction 80/140 - 63/140, it becomes 17/140.

Pie Chart Representation: 4/7 - 9/20 = 17/140

CALCULATION: 4/7 - 9/20 as a fraction
4/7 - 9/20 = (?)
4/7 - 9/20 = [(4 x 20) - (9 x 7)]/(7 x 20)
= (80 - 63)/140
= 17/140
4/7 - 9/20 = 17/140
4/7 minus 9/20 as a fraction is 17/140.

where
4/7 is a proper fraction as a minuend,
9/20 is a proper fraction as a subtrahend,
17/140 is the difference between 4/7 and 9/20.

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4/7 minus 9/20 as a decimal
4/7 - 9/20 = 17/140
17/140 = 0.1214
(4/7) - (9/20) as a decimal is 0.1214

where
0.1214 is the difference between 4/7 and 9/20.

The below workout with step by step calculation shows how to find what is the difference between two fractions by subtracting a fraction 9/20 from 4/7. For different, unequal or unlike denominators, use any one of the following methods to find the equivalent fraction for 4/7 minus 9/20.
1. LCM method
2. Cross multiplication method.

(4/7) - (9/20) using LCM Method:
What is 4/7 minus 9/20 as a fraction?

step 1 Observe the input parameters and what to be found:
Input:
Fraction A: 4/7
Fraction B: 9/20

What to be found?
(4/7) - (9/20) = ?
Find what's the difference between 4/7 and 9/20.

step 2 Compare the denominators of fractions 4/7 and 9/20 to identify whether it is a like or unlike fraction subtraction. Since the denominators of given fractions 4/7 and 9/20 are not equal, it is said to be unlike fractions subtraction.

step 3For unlike fractions subtraction, find the LCM (least common multiple) of both denominators of fractions 4/7 and 9/20:
The LCM of 7 and 20 is 140.

step 4 Write the fractions 4/7 and 9/20 in the subtraction expression form and multiply LCM with all the numerators and denominators of both fractions.
= 4/7 - 9/20
= [(4 x 140)/(7 x 140)] - [(9 x 140)/(20 x 140)]

step 5 Simplify the expression to have common denominator:
= 80/140 - 63/140

step 6 Take the common values out and rewrite the above expression like the below:
= 1/140 x (80/1 - 63/1)
= 1/140 x (80 - 63)

step 7Simplify the above expression further:
= 1/140 x 17
= 17/140
4/7 - 9/20 = 17/140

Hence,
4/7 minus 9/20 as a fraction is 17/140.

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4/7 - 9/20 using Cross Multiplication Method:
step 1 Observe the input parameters and what to be found:
Input:
Fraction A: 4/7
Fraction B: 9/20

What to be found?
(4/7)-(9/20) = ?
Find what's the difference between 4/7 and 9/20.

step 2 Find the product of numerator of Fraction A and denominator of Fraction B (4 x 20), find the product of numerator of Fraction B and denominator of Fraction A (9 x 7), and find the product of both denominators of Fraction A and Fraction B (7 x 20) and rewrite the equation as like the below:
= (4 x 20) - (9 x 7)/(7 x 20)

step 3 Simplify and rewrite the fraction:
= (80 - 63)/140
4/7 - 9/20 = 17/140

Hence,
4/7 minus 9/20 in fraction is 17/140