7/8 - 9/7 as a fraction

Learn how to find what is 7/8 minus 9/7 in fraction form just in a few minutes. We have covered the easiest method to write 7/8 - 9/7 as a fraction and decimal.

Summary: 7/8 minus 9/7 = -23/56
Since both fractions have unequal denominators, 7/8 minus 9/7 is an unlike fractions subtraction. For subtracting unlike fractions, you have to first find the equivalent fractions for fraction 7/8 and fraction 9/7 in order to have the same denominators for both fractions. Therefore, you have to find the LCM of denominators 8 and 7. 56 is the LCM of 8 and 7. Multiplying the LCM 56 with the numerators and denominators of both fractions (7/8 x 56/56) - (9/7 x 56/56), and simplify further in order to have the common denominator. So the equivalent fraction for 7/8 is 49/56 and for 9/7 is 72/56. By simplifying this fraction subtraction 49/56 - 72/56, it becomes -23/56.

CALCULATION: 7/8 - 9/7 as a fraction
7/8 - 9/7 = (?)
7/8 - 9/7 = [(7 x 7) - (9 x 8)]/(8 x 7)
= (49 - 72)/56
= -23/56
7/8 - 9/7 = -23/56
7/8 minus 9/7 as a fraction is -23/56.

where
7/8 is a proper fraction as a minuend,
9/7 is a improper fraction as a subtrahend,
-23/56 is the difference between 7/8 and 9/7.

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7/8 minus 9/7 as a decimal
7/8 - 9/7 = -23/56
-23/56 = -0.4107
(7/8) - (9/7) as a decimal is -0.4107

where
-0.4107 is the difference between 7/8 and 9/7.

The below workout with step by step calculation shows how to find what is the difference between two fractions by subtracting a fraction 9/7 from 7/8. For different, unequal or unlike denominators, use any one of the following methods to find the equivalent fraction for 7/8 minus 9/7.
1. LCM method
2. Cross multiplication method.

(7/8) - (9/7) using LCM Method:
What is 7/8 minus 9/7 as a fraction?

step 1 Observe the input parameters and what to be found:
Input:
Fraction A: 7/8
Fraction B: 9/7

What to be found?
(7/8) - (9/7) = ?
Find what's the difference between 7/8 and 9/7.

step 2 Compare the denominators of fractions 7/8 and 9/7 to identify whether it is a like or unlike fraction subtraction. Since the denominators of given fractions 7/8 and 9/7 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 7/8 and 9/7:
The LCM of 8 and 7 is 56.

step 4 Write the fractions 7/8 and 9/7 in the subtraction expression form and multiply LCM with all the numerators and denominators of both fractions.
= 7/8 - 9/7
= [(7 x 56)/(8 x 56)] - [(9 x 56)/(7 x 56)]

step 5 Simplify the expression to have common denominator:
= 49/56 - 72/56

step 6 Take the common values out and rewrite the above expression like the below:
= 1/56 x (49/1 - 72/1)
= 1/56 x (49 - 72)

step 7Simplify the above expression further:
= 1/56 x -23
= -23/56
7/8 - 9/7 = -23/56

Hence,
7/8 minus 9/7 as a fraction is -23/56.

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7/8 - 9/7 using Cross Multiplication Method:
step 1 Observe the input parameters and what to be found:
Input:
Fraction A: 7/8
Fraction B: 9/7

What to be found?
(7/8)-(9/7) = ?
Find what's the difference between 7/8 and 9/7.

step 2 Find the product of numerator of Fraction A and denominator of Fraction B (7 x 7), find the product of numerator of Fraction B and denominator of Fraction A (9 x 8), and find the product of both denominators of Fraction A and Fraction B (8 x 7) and rewrite the equation as like the below:
= (7 x 7) - (9 x 8)/(8 x 7)

step 3 Simplify and rewrite the fraction:
= (49 - 72)/56
7/8 - 9/7 = -23/56

Hence,
7/8 minus 9/7 in fraction is -23/56