Add 81/7 and 21/81
1st number: 11 4/7, 2nd number: 21/81
81/7 + 21/81 is 2236/189.
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,
81/7 = 81 × 81/7 × 81 = 6561/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
21/81 = 21 × 7/81 × 7 = 147/567 - Add the two like fractions:
6561/567 + 147/567 = 6561 + 147/567 = 6708/567 - 6708/567 simplified gives 2236/189
- So, 81/7 + 21/81 = 2236/189
In mixed form: 11157/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 81/7+42/81 81/14+21/81 81/7+63/81 81/21+21/81 81/35+21/81 81/49+21/81