Add 28/63 and 63/81
28/63 + 63/81 is 11/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 63 × 9 = 567,
28/63 = 28 × 9/63 × 9 = 252/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
63/81 = 63 × 7/81 × 7 = 441/567 - Add the two like fractions:
252/567 + 441/567 = 252 + 441/567 = 693/567 - 693/567 simplified gives 11/9
- So, 28/63 + 63/81 = 11/9
In mixed form: 12/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/63+63/81 84/63+63/81