What is 7/9 - 5/7?

The below workout with step by step calculation shows how to find what is the difference between two fractions by subtracting a fraction 5/7 from 7/9. For different, unequal or unlike denominators, use any one of the following methods to find the equivalent fraction for 7/9 minus 5/7.
1. LCM method
2. Cross multiplication method.

Problem and Workout - LCM Method
What is 7/9 minus 5/7 as a fraction by subtraction using LCM method?

step 1 Address formula, input parameters and values.
Input parameters and values:
7/9 & 5/7
7/9-5/7 = ?

step 2 For unequal denominators, find the LCM (least common multiple) for both denominators
The LCM for 9 and 7 is 63.

step 3 To have the common denominator, multiply the LCM with both numerator and denominator
=(7 x 63)/(9 x 63)-(5 x 63)/(7 x 63)
=49/63-45/63
=(49 - 45)/63

step 4 Find difference between numerators and rewrite it in a single form.
=4/63
7/9-5/7=4/63

By using LCM method, 4/63 is the equivalent fraction by subtracting 5/7 from 7/9.

Problem and Workout - Cross Multiplication Method
step 1 Address formula and input values.
Input values:
7/9 & 5/7
7/9 - 5/7 = ?

step 2 Cross multiply both numerator and denominator, multiply both denominators and rewrite as below
= (7 x 7) - (5 x 9)/(9 x 7)

step 3 Simplify and rewrite the fraction
= (49 - 45)/63
7/9-5/7 = 4/63
By using cross multiplication method, 4/63 is the difference between two fractions 7/9 and 5/7.