Add 7/15 and 30/81
7/15 + 30/81 is 113/135.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 15 × 27 = 405,
7/15 = 7 × 27/15 × 27 = 189/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
30/81 = 30 × 5/81 × 5 = 150/405 - Add the two like fractions:
189/405 + 150/405 = 189 + 150/405 = 339/405 - 339/405 simplified gives 113/135
- So, 7/15 + 30/81 = 113/135
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/15+30/81 7/15+60/81 7/30+30/81 21/15+30/81 7/15+90/81 7/45+30/81 35/15+30/81 7/75+30/81 49/15+30/81