Add 28/7 and 21/81
1st number: 4 0/7, 2nd number: 21/81
28/7 + 21/81 is 115/27.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 7 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 7 × 81 = 567,
28/7 = 28 × 81/7 × 81 = 2268/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
21/81 = 21 × 7/81 × 7 = 147/567 - Add the two like fractions:
2268/567 + 147/567 = 2268 + 147/567 = 2415/567 - 2415/567 simplified gives 115/27
- So, 28/7 + 21/81 = 115/27
In mixed form: 47/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/7+21/81 28/7+42/81 28/14+21/81 84/7+21/81 28/7+63/81 28/21+21/81 28/35+21/81 28/49+21/81