Add 16/21 and 28/81
16/21 + 28/81 is 628/567.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 81 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 21 × 27 = 567,
16/21 = 16 × 27/21 × 27 = 432/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
28/81 = 28 × 7/81 × 7 = 196/567 - Add the two like fractions:
432/567 + 196/567 = 432 + 196/567 = 628/567 - So, 16/21 + 28/81 = 628/567
In mixed form: 161/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 32/21+28/81 16/21+56/81 16/42+28/81 48/21+28/81 16/21+84/81 16/63+28/81 80/21+28/81