Add 21/81 and 3/9
21/81 + 3/9 is 16/27.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 9 is 81
Next, find the equivalent fraction of both fractional numbers with denominator 81 - For the 1st fraction, since 81 × 1 = 81,
21/81 = 21 × 1/81 × 1 = 21/81 - Likewise, for the 2nd fraction, since 9 × 9 = 81,
3/9 = 3 × 9/9 × 9 = 27/81 - Add the two like fractions:
21/81 + 27/81 = 21 + 27/81 = 48/81 - 48/81 simplified gives 16/27
- So, 21/81 + 3/9 = 16/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/81+3/9 21/81+6/9 21/81+3/18 63/81+3/9 21/81+3/27 21/81+15/9 21/81+3/45 21/81+21/9 21/81+3/63