Add 21/81 and 6/8
21/81 + 6/8 is 109/108.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 8 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 81 × 8 = 648,
21/81 = 21 × 8/81 × 8 = 168/648 - Likewise, for the 2nd fraction, since 8 × 81 = 648,
6/8 = 6 × 81/8 × 81 = 486/648 - Add the two like fractions:
168/648 + 486/648 = 168 + 486/648 = 654/648 - 654/648 simplified gives 109/108
- So, 21/81 + 6/8 = 109/108
In mixed form: 11/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/81+6/8 21/81+12/8 21/81+6/16 63/81+6/8 21/81+18/8 21/81+6/24 21/81+30/8 21/81+6/40 21/81+42/8 21/81+6/56