Add 18/21 and 4/81
18/21 + 4/81 is 514/567.
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,
18/21 = 18 × 27/21 × 27 = 486/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
4/81 = 4 × 7/81 × 7 = 28/567 - Add the two like fractions:
486/567 + 28/567 = 486 + 28/567 = 514/567 - So, 18/21 + 4/81 = 514/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/21+4/81 18/21+8/81 18/42+4/81 54/21+4/81 18/21+12/81 18/63+4/81 90/21+4/81 18/21+20/81 18/21+28/81