Add 5/81 and 21/30
5/81 + 21/30 is 617/810.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 30 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 81 × 10 = 810,
5/81 = 5 × 10/81 × 10 = 50/810 - Likewise, for the 2nd fraction, since 30 × 27 = 810,
21/30 = 21 × 27/30 × 27 = 567/810 - Add the two like fractions:
50/810 + 567/810 = 50 + 567/810 = 617/810 - So, 5/81 + 21/30 = 617/810
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/81+21/30 5/81+42/30 5/81+21/60 15/81+21/30 5/81+63/30 5/81+21/90 25/81+21/30 35/81+21/30