Add 25/12 and 21/27, Solve 2 1/12 + 21/27 as a fraction

Add 25/12 and 21/27

1^st number: 2 1/12, 2^nd number: 21/27

25/12 + 21/27 is 103/36.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 27 is 108

Next, find the equivalent fraction of both fractional numbers with denominator 108
For the 1st fraction, since 12 × 9 = 108,
25/12 = 25 × 9/12 × 9 = 225/108
Likewise, for the 2nd fraction, since 27 × 4 = 108,
21/27 = 21 × 4/27 × 4 = 84/108
Add the two like fractions:
225/108 + 84/108 = 225 + 84/108 = 309/108
309/108 simplified gives 103/36
So, 25/12 + 21/27 = 103/36
In mixed form: 231/36

MathStep (Works offline)

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