Add 15/27 and 90/80, Solve 15/27 + 1 10/80 as a fraction

Add 15/27 and 90/80

1^st number: 15/27, 2^nd number: 1 10/80

15/27 + 90/80 is 121/72.

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

Next, find the equivalent fraction of both fractional numbers with denominator 2160
For the 1st fraction, since 27 × 80 = 2160,
15/27 = 15 × 80/27 × 80 = 1200/2160
Likewise, for the 2nd fraction, since 80 × 27 = 2160,
90/80 = 90 × 27/80 × 27 = 2430/2160
Add the two like fractions:
1200/2160 + 2430/2160 = 1200 + 2430/2160 = 3630/2160
3630/2160 simplified gives 121/72
So, 15/27 + 90/80 = 121/72
In mixed form: 149/72

MathStep (Works offline)

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