# What is 1/4 + 1/5? getcalc.com's two fractions addition calculator is an online basic math function tool to find what's the equivalent fraction for sum of two fractional numbers with different, unequal or unlike denominators 1/4 and 1/5.

1/4 + 1/5 = 9/20 in fraction form

1/4 + 1/5 = 0.45 in decimal form
This calculator, formula, step by step calculation and associated information for adding 1/4 and 1/5 may help students, teachers, parents or professionals to learn, teach, practice or verify such two fractions addition calculations efficiently.

## How to Find Equivalent Fraction for 1/4+1/5?

The below workout with step by step calculation shows how to find the equivalent fraction between 1/4 and 1/5 by adding two fractions with different, unequal or unlike denominators. The sum in fraction form for 1/4 plus 1/5 can be obtained by using anyone of the two methods below.
1. LCM method
2. Cross multiplication method.

Problem and Workout - LCM Method
What is 1/4 plus 1/5 as a fraction by addition using LCM method?

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

step 2 For unequal denominators, find the LCM (least common multiple) for both denominators
The LCM for 4 and 5 is 20.

step 3 To have the common denominator, multiply the LCM with both numerator and denominator
=(1 x 20)/(4 x 20)+(1 x 20)/(5 x 20)
=5/20+4/20
=(5 + 4)/20

step 4 Add both numerator and rewrite it in a single form.
=9/20
1/4+1/5=9/20

By using LCM method, 9/20 is the equivalent fraction by adding 1/4 and 1/5.

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

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

step 3 Simplify and rewrite the fraction
= (5 + 4)/20
1/4+1/5 = 9/20
By using cross multiplication method, 9/20 is the addition between two fractions 1/4 and 1/5. 