# What is 1/8 - 1/7? getcalc.com's two fractions subtraction calculator is an online basic math function tool to find what's the equivalent fraction for difference between two fractional numbers with different, unequal or unlike denominators 1/8 and 1/7.

1/8 - 1/7 = -1/56 in fraction form

1/8 - 1/7 = -0.0179 in decimal form
This calculator, formula, step by step calculation and associated information to find the difference between 1/8 and 1/7 may help students, teachers, parents or professionals to learn, teach, practice or verify such two fractions subtraction calculations efficiently.

## How to Find Equivalent Fraction for 1/8-1/7?

The below workout with step by step calculation shows how to find what is the difference between two fractions by subtracting a fraction 1/7 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 1/7.
1. LCM method
2. Cross multiplication method.

Problem and Workout - LCM Method
What is 1/8 minus 1/7 as a fraction by subtraction using LCM method?

step 1 Address formula, input parameters and values.
Input parameters and values:
1/8 & 1/7
1/8-1/7 = ?

step 2 For unequal denominators, find the LCM (least common multiple) for both denominators
The LCM for 8 and 7 is 56.

step 3 To have the common denominator, multiply the LCM with both numerator and denominator
=(1 x 56)/(8 x 56)-(1 x 56)/(7 x 56)
=7/56-8/56
=(7 - 8)/56

step 4 Find difference between numerators and rewrite it in a single form.
=-1/56
1/8-1/7=-1/56

By using LCM method, -1/56 is the equivalent fraction by subtracting 1/7 from 1/8.

Problem and Workout - Cross Multiplication Method
step 1 Address formula and input values.
Input values:
1/8 & 1/7
1/8 - 1/7 = ?

step 2 Cross multiply both numerator and denominator, multiply both denominators and rewrite as below
= (1 x 7) - (1 x 8)/(8 x 7)

step 3 Simplify and rewrite the fraction
= (7 - 8)/56
1/8-1/7 = -1/56
By using cross multiplication method, -1/56 is the difference between two fractions 1/8 and 1/7. 