Add 27/15 and 15/8, Solve 1 12/15 + 1 7/8 as a fraction

Add 27/15 and 15/8

1^st number: 1 12/15, 2^nd number: 1 7/8

27/15 + 15/8 is 147/40.

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 8 is 120

Next, find the equivalent fraction of both fractional numbers with denominator 120
For the 1st fraction, since 15 × 8 = 120,
27/15 = 27 × 8/15 × 8 = 216/120
Likewise, for the 2nd fraction, since 8 × 15 = 120,
15/8 = 15 × 15/8 × 15 = 225/120
Add the two like fractions:
216/120 + 225/120 = 216 + 225/120 = 441/120
441/120 simplified gives 147/40
So, 27/15 + 15/8 = 147/40
In mixed form: 327/40

MathStep (Works offline)

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