Add 28/12 and 30/81, Solve 2 4/12 + 30/81 as a fraction

Add 28/12 and 30/81

1^st number: 2 4/12, 2^nd number: 30/81

28/12 + 30/81 is 73/27.

Find the least common denominator or LCM of the two denominators:
LCM of 12 and 81 is 324

Next, find the equivalent fraction of both fractional numbers with denominator 324
For the 1st fraction, since 12 × 27 = 324,
28/12 = 28 × 27/12 × 27 = 756/324
Likewise, for the 2nd fraction, since 81 × 4 = 324,
30/81 = 30 × 4/81 × 4 = 120/324
Add the two like fractions:
756/324 + 120/324 = 756 + 120/324 = 876/324
876/324 simplified gives 73/27
So, 28/12 + 30/81 = 73/27
In mixed form: 219/27

MathStep (Works offline)

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