Add 10/80 and 90/72, Solve 10/80 + 1 18/72 as a fraction

Add 10/80 and 90/72

1^st number: 10/80, 2^nd number: 1 18/72

10/80 + 90/72 is 11/8.

Find the least common denominator or LCM of the two denominators:
LCM of 80 and 72 is 720

Next, find the equivalent fraction of both fractional numbers with denominator 720
For the 1st fraction, since 80 × 9 = 720,
10/80 = 10 × 9/80 × 9 = 90/720
Likewise, for the 2nd fraction, since 72 × 10 = 720,
90/72 = 90 × 10/72 × 10 = 900/720
Add the two like fractions:
90/720 + 900/720 = 90 + 900/720 = 990/720
990/720 simplified gives 11/8
So, 10/80 + 90/72 = 11/8
In mixed form: 13/8

MathStep (Works offline)

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