Add 5/21 and 25/81
5/21 + 25/81 is 310/567.
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,
5/21 = 5 × 27/21 × 27 = 135/567 - Likewise, for the 2nd fraction, since 81 × 7 = 567,
25/81 = 25 × 7/81 × 7 = 175/567 - Add the two like fractions:
135/567 + 175/567 = 135 + 175/567 = 310/567 - So, 5/21 + 25/81 = 310/567
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+25/81 5/21+50/81 5/42+25/81 15/21+25/81 5/21+75/81 5/63+25/81 25/21+25/81 35/21+25/81