Add 15/81 and 5/7
15/81 + 5/7 is 170/189.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 7 is 567
Next, find the equivalent fraction of both fractional numbers with denominator 567 - For the 1st fraction, since 81 × 7 = 567,
15/81 = 15 × 7/81 × 7 = 105/567 - Likewise, for the 2nd fraction, since 7 × 81 = 567,
5/7 = 5 × 81/7 × 81 = 405/567 - Add the two like fractions:
105/567 + 405/567 = 105 + 405/567 = 510/567 - 510/567 simplified gives 170/189
- So, 15/81 + 5/7 = 170/189
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/81+5/7 15/81+10/7 15/81+5/14 45/81+5/7 15/81+15/7 15/81+5/21 75/81+5/7 15/81+25/7 15/81+5/35 15/81+35/7 15/81+5/49