Add 3/81 and 21/4
1st number: 3/81, 2nd number: 5 1/4
3/81 + 21/4 is 571/108.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 4 is 324
Next, find the equivalent fraction of both fractional numbers with denominator 324 - For the 1st fraction, since 81 × 4 = 324,
3/81 = 3 × 4/81 × 4 = 12/324 - Likewise, for the 2nd fraction, since 4 × 81 = 324,
21/4 = 21 × 81/4 × 81 = 1701/324 - Add the two like fractions:
12/324 + 1701/324 = 12 + 1701/324 = 1713/324 - 1713/324 simplified gives 571/108
- So, 3/81 + 21/4 = 571/108
In mixed form: 531/108
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/81+21/4 3/81+42/4 3/81+21/8 9/81+21/4 3/81+63/4 3/81+21/12 15/81+21/4 3/81+21/20 21/81+21/4 3/81+21/28