Add 5/80 and 21/27, Solve 5/80 + 21/27 as a fraction

Add 5/80 and 21/27

5/80 + 21/27 is 121/144.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 27 is 2160

Next, find the equivalent fraction of both fractional numbers with denominator 2160
For the 1st fraction, since 80 × 27 = 2160,
5/80 = 5 × 27/80 × 27 = 135/2160
Likewise, for the 2nd fraction, since 27 × 80 = 2160,
21/27 = 21 × 80/27 × 80 = 1680/2160
Add the two like fractions:
135/2160 + 1680/2160 = 135 + 1680/2160 = 1815/2160
1815/2160 simplified gives 121/144
So, 5/80 + 21/27 = 121/144

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad