Add 24/15 and 42/27, Solve 1 9/15 + 1 15/27 as a fraction

Add 24/15 and 42/27

1^st number: 1 9/15, 2^nd number: 1 15/27

24/15 + 42/27 is 142/45.

Find the least common denominator or LCM of the two denominators:
LCM of 15 and 27 is 135

Next, find the equivalent fraction of both fractional numbers with denominator 135
For the 1st fraction, since 15 × 9 = 135,
24/15 = 24 × 9/15 × 9 = 216/135
Likewise, for the 2nd fraction, since 27 × 5 = 135,
42/27 = 42 × 5/27 × 5 = 210/135
Add the two like fractions:
216/135 + 210/135 = 216 + 210/135 = 426/135
426/135 simplified gives 142/45
So, 24/15 + 42/27 = 142/45
In mixed form: 37/45

MathStep (Works offline)

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