# What is 7/8 minus 1/9?

7/8 - 1/9 as a fraction provides the detailed information about what is the difference between 7/8 and 1/9 in fraction and decimal form, and the answer with steps to understand how it is being calculated by using different methods.**7/8-1/9 equals to**

7/8 - 1/9 = 55/72

Hence, 7/8 - 1/9 is equal to **55/72**.__where__

7/8 is a fraction as a minuend,

1/9 is a fraction as a subtrahend,

55/72 is the difference between 7/8 and 1/9.**7/8 minus 1/9 as a decimal**

7/8 - 1/9 = 55/72

55/72 = 0.7639

Hence, 7/8-1/9 can be written as **0.7639** in decimal.__where__

0.7639 is the difference between 7/8 and 1/9.

## How-to: 7/8 - 1/9 = ?

1. LCM method,

2. Cross multiplication method.

__Problem and Workout - LCM Method:__

What is 7/8 minus 1/9 as a fraction?

step 1 Observe the input parameters and what to be found:__Input:__

Fraction A: 7/8

Fraction B: 1/9__What to be found?__

7/8-1/9 = ?

Find what's the difference between 7/8 and 1/9.

step 2 Compare the denominators of fractions 7/8 and 1/9 to identify whether it is a like or unlike fraction subtraction. Since the denominators of given fractions 7/8 and 1/9 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 1/9:

The LCM of 8 and 9 is 72.

step 4 Write the fractions 7/8 and 1/9 in the subtraction expression form and multiply LCM with all the numerators and denominators of both fractions.

=7/8-1/9

=(7 x 72)/(8 x 72)-(1 x 72)/(9 x 72)

step 5 Simplify the expression to have common denominator:

=63/72-8/72

step 6 Take the common values out and rewrite the above expression like the below:

=1/72 x (63/1-8/1)

=1/72 x (63 - 8)

step 7Simplify the above expression further:

=1/72 x 55

=55/72

7/8-1/9=55/72

Hence,

7/8 minus 1/9 equals to **55/72** in fraction.

__Problem and Workout - Cross Multiplication Method__

step 1 Observe the input parameters and what to be found:__Input:__

Fraction A: 7/8

Fraction B: 1/9__What to be found?__

7/8-1/9 = ?

Find what's the difference between 7/8 and 1/9.

step 2 Find the product of numerator of Fraction A and denominator of Fraction B (7 x 9), find the product of numerator of Fraction B and denominator of Fraction A (1 x 8), and find the product of both denominators of Fraction A and Fraction B (8 x 9) and rewrite the equation as like the below:

= (7 x 9) - (1 x 8)/(8 x 9)

step 3 Simplify and rewrite the fraction:

= (63 - 8)/72

7/8-1/9 = 55/72

Hence,

7/8 minus 1/9 = **55/72**