7/9 minus 3/4 as a fraction

The below workout with step by step calculation shows how to find what is 7/9 minus 3/4 in simplest form by using the following methods:
1. LCM method,
2. Cross multiplication method.

Problem and Workout - LCM Method:
What is 7/9 minus 3/4 as a fraction?

step 1 Observe the input parameters and what to be found:
Input:
Fraction A: 7/9
Fraction B: 3/4

What to be found?
7/9-3/4 = ?
Find what's the difference between 7/9 and 3/4.

step 2 Compare the denominators of fractions 7/9 and 3/4 to identify whether it is a like or unlike fraction subtraction. Since the denominators of given fractions 7/9 and 3/4 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 7/9 and 3/4:
The LCM of 9 and 4 is 36.

step 4 Write the fractions 7/9 and 3/4 in the subtraction expression form and multiply LCM with all the numerators and denominators of both fractions.
=7/9-3/4
=(7 x 36)/(9 x 36)-(3 x 36)/(4 x 36)

step 5 Simplify the expression to have common denominator:
=28/36-27/36

step 6 Take the common values out and rewrite the above expression like the below:
=1/36 x (28/1-27/1)
=1/36 x (28 - 27)

step 7Simplify the above expression further:
=1/36 x 1
=1/36
7/9-3/4=1/36

Hence,
7/9 minus 3/4 equals to 1/36 in fraction.

Problem and Workout - Cross Multiplication Method
step 1 Observe the input parameters and what to be found:
Input:
Fraction A: 7/9
Fraction B: 3/4

What to be found?
7/9-3/4 = ?
Find what's the difference between 7/9 and 3/4.

step 2 Find the product of numerator of Fraction A and denominator of Fraction B (7 x 4), find the product of numerator of Fraction B and denominator of Fraction A (3 x 9), and find the product of both denominators of Fraction A and Fraction B (9 x 4) and rewrite the equation as like the below:
= (7 x 4) - (3 x 9)/(9 x 4)

step 3 Simplify and rewrite the fraction:
= (28 - 27)/36
7/9-3/4 = 1/36
Hence,
7/9 minus 3/4 = 1/36