Add 21/16 and 7/81
1st number: 1 5/16, 2nd number: 7/81
21/16 + 7/81 is 1813/1296.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 16 and 81 is 1296
Next, find the equivalent fraction of both fractional numbers with denominator 1296 - For the 1st fraction, since 16 × 81 = 1296,
21/16 = 21 × 81/16 × 81 = 1701/1296 - Likewise, for the 2nd fraction, since 81 × 16 = 1296,
7/81 = 7 × 16/81 × 16 = 112/1296 - Add the two like fractions:
1701/1296 + 112/1296 = 1701 + 112/1296 = 1813/1296 - So, 21/16 + 7/81 = 1813/1296
In mixed form: 1517/1296
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/16+7/81 21/16+14/81 21/32+7/81 63/16+7/81 21/16+21/81 21/48+7/81 21/16+35/81 21/80+7/81 21/16+49/81