Add 21/24 and 40/81
21/24 + 40/81 is 887/648.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 24 and 81 is 648
Next, find the equivalent fraction of both fractional numbers with denominator 648 - For the 1st fraction, since 24 × 27 = 648,
21/24 = 21 × 27/24 × 27 = 567/648 - Likewise, for the 2nd fraction, since 81 × 8 = 648,
40/81 = 40 × 8/81 × 8 = 320/648 - Add the two like fractions:
567/648 + 320/648 = 567 + 320/648 = 887/648 - So, 21/24 + 40/81 = 887/648
In mixed form: 1239/648
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/24+40/81 21/24+80/81 21/48+40/81 63/24+40/81 21/72+40/81