What is 1/8 - 4/5?

The below workout with step by step calculation shows how to find what is the difference between two fractions by subtracting a fraction 4/5 from 1/8. For different, unequal or unlike denominators, use any one of the following methods to find the equivalent fraction for 1/8 minus 4/5.
1. LCM method
2. Cross multiplication method.

Problem and Workout - LCM Method
What is 1/8 minus 4/5 as a fraction by subtraction using LCM method?

step 1 Address formula, input parameters and values.
Input parameters and values:
1/8 & 4/5
1/8-4/5 = ?

step 2 For unequal denominators, find the LCM (least common multiple) for both denominators
The LCM for 8 and 5 is 40.

step 3 To have the common denominator, multiply the LCM with both numerator and denominator
=(1 x 40)/(8 x 40)-(4 x 40)/(5 x 40)
=5/40-32/40
=(5 - 32)/40

step 4 Find difference between numerators and rewrite it in a single form.
=-27/40
1/8-4/5=-27/40

By using LCM method, -27/40 is the equivalent fraction by subtracting 4/5 from 1/8.

Problem and Workout - Cross Multiplication Method
step 1 Address formula and input values.
Input values:
1/8 & 4/5
1/8 - 4/5 = ?

step 2 Cross multiply both numerator and denominator, multiply both denominators and rewrite as below
= (1 x 5) - (4 x 8)/(8 x 5)

step 3 Simplify and rewrite the fraction
= (5 - 32)/40
1/8-4/5 = -27/40
By using cross multiplication method, -27/40 is the difference between two fractions 1/8 and 4/5.