Add 15/80 and 80/9, Solve 15/80 + 8 8/9 as a fraction

Add 15/80 and 80/9

1^st number: 15/80, 2^nd number: 8 8/9

15/80 + 80/9 is 1307/144.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 9 is 720

Next, find the equivalent fraction of both fractional numbers with denominator 720
For the 1st fraction, since 80 × 9 = 720,
15/80 = 15 × 9/80 × 9 = 135/720
Likewise, for the 2nd fraction, since 9 × 80 = 720,
80/9 = 80 × 80/9 × 80 = 6400/720
Add the two like fractions:
135/720 + 6400/720 = 135 + 6400/720 = 6535/720
6535/720 simplified gives 1307/144
So, 15/80 + 80/9 = 1307/144
In mixed form: 911/144

MathStep (Works offline)

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