Add 7/4 and 21/81
1st number: 1 3/4, 2nd number: 21/81
7/4 + 21/81 is 217/108.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 81 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 4 × 81 = 324,
7/4 = 7 × 81/4 × 81 = 567/324 - Likewise, for the 2nd fraction, since 81 × 4 = 324,
21/81 = 21 × 4/81 × 4 = 84/324 - Add the two like fractions:
567/324 + 84/324 = 567 + 84/324 = 651/324 - 651/324 simplified gives 217/108
- So, 7/4 + 21/81 = 217/108
In mixed form: 21/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/4+21/81 7/4+42/81 7/8+21/81 21/4+21/81 7/4+63/81 7/12+21/81 35/4+21/81 7/20+21/81 49/4+21/81 7/28+21/81