Add 28/30 and 12/81
28/30 + 12/81 is 146/135.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 30 and 81 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 30 × 27 = 810,
28/30 = 28 × 27/30 × 27 = 756/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
12/81 = 12 × 10/81 × 10 = 120/810 - Add the two like fractions:
756/810 + 120/810 = 756 + 120/810 = 876/810 - 876/810 simplified gives 146/135
- So, 28/30 + 12/81 = 146/135
In mixed form: 111/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/30+12/81 28/30+24/81 28/60+12/81 84/30+12/81 28/30+36/81 28/90+12/81 28/30+60/81 28/30+84/81