Add 21/81 and 9/28
21/81 + 9/28 is 439/756.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 28 is 2268
Next, find the equivalent fraction of both fractional numbers with denominator 2268 - For the 1st fraction, since 81 × 28 = 2268,
21/81 = 21 × 28/81 × 28 = 588/2268 - Likewise, for the 2nd fraction, since 28 × 81 = 2268,
9/28 = 9 × 81/28 × 81 = 729/2268 - Add the two like fractions:
588/2268 + 729/2268 = 588 + 729/2268 = 1317/2268 - 1317/2268 simplified gives 439/756
- So, 21/81 + 9/28 = 439/756
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/81+9/28 21/81+18/28 21/81+9/56 63/81+9/28 21/81+27/28 21/81+9/84 21/81+45/28 21/81+63/28