Add 15/80 and 40/27, Solve 15/80 + 1 13/27 as a fraction

Add 15/80 and 40/27

1^st number: 15/80, 2^nd number: 1 13/27

15/80 + 40/27 is 721/432.

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,
15/80 = 15 × 27/80 × 27 = 405/2160
Likewise, for the 2nd fraction, since 27 × 80 = 2160,
40/27 = 40 × 80/27 × 80 = 3200/2160
Add the two like fractions:
405/2160 + 3200/2160 = 405 + 3200/2160 = 3605/2160
3605/2160 simplified gives 721/432
So, 15/80 + 40/27 = 721/432
In mixed form: 1289/432

MathStep (Works offline)

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