Add 28/21 and 49/81
1st number: 1 7/21, 2nd number: 49/81
28/21 + 49/81 is 157/81.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 21 × 27 = 567,
28/21 = 28 × 27/21 × 27 = 756/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
49/81 = 49 × 7/81 × 7 = 343/567 - Add the two like fractions:
756/567 + 343/567 = 756 + 343/567 = 1099/567 - 1099/567 simplified gives 157/81
- So, 28/21 + 49/81 = 157/81
In mixed form: 176/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21+49/81 28/21+98/81 28/42+49/81 84/21+49/81 28/63+49/81