What is 1/5 - 3/10?

The below workout with step by step calculation shows how to find what is the difference between two fractions by subtracting a fraction 3/10 from 1/5. For different, unequal or unlike denominators, use any one of the following methods to find the equivalent fraction for 1/5 minus 3/10.
1. LCM method
2. Cross multiplication method.

Problem and Workout - LCM Method
What is 1/5 minus 3/10 as a fraction by subtraction using LCM method?

step 1 Address formula, input parameters and values.
Input parameters and values:
1/5 & 3/10
1/5-3/10 = ?

step 2 For unequal denominators, find the LCM (least common multiple) for both denominators
The LCM for 5 and 10 is 10.

step 3 To have the common denominator, multiply the LCM with both numerator and denominator
=(1 x 10)/(5 x 10)-(3 x 10)/(10 x 10)
=2/10-3/10
=(2 - 3)/10

step 4 Find difference between numerators and rewrite it in a single form.
=-1/10
1/5-3/10=-1/10

By using LCM method, -1/10 is the equivalent fraction by subtracting 3/10 from 1/5.

Problem and Workout - Cross Multiplication Method
step 1 Address formula and input values.
Input values:
1/5 & 3/10
1/5 - 3/10 = ?

step 2 Cross multiply both numerator and denominator, multiply both denominators and rewrite as below
= (1 x 10) - (3 x 5)/(5 x 10)

step 3 Simplify and rewrite the fraction
= (10 - 15)/50
= -5/50
= -1/10
1/5-3/10 = -1/10
By using cross multiplication method, -1/10 is the difference between two fractions 1/5 and 3/10.