Add 28/90 and 3/81
28/90 + 3/81 is 47/135.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 81 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 90 × 9 = 810,
28/90 = 28 × 9/90 × 9 = 252/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
3/81 = 3 × 10/81 × 10 = 30/810 - Add the two like fractions:
252/810 + 30/810 = 252 + 30/810 = 282/810 - 282/810 simplified gives 47/135
- So, 28/90 + 3/81 = 47/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/90+3/81 28/90+6/81 84/90+3/81 28/90+9/81 28/90+15/81 28/90+21/81