Add 15/21 and 16/81
15/21 + 16/81 is 517/567.
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,
15/21 = 15 × 27/21 × 27 = 405/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
16/81 = 16 × 7/81 × 7 = 112/567 - Add the two like fractions:
405/567 + 112/567 = 405 + 112/567 = 517/567 - So, 15/21 + 16/81 = 517/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/21+16/81 15/21+32/81 15/42+16/81 45/21+16/81 15/21+48/81 15/63+16/81 75/21+16/81 15/21+80/81