Add 18/81 and 8/5
1st number: 18/81, 2nd number: 1 3/5
18/81 + 8/5 is 82/45.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 5 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 81 × 5 = 405,
18/81 = 18 × 5/81 × 5 = 90/405 - Likewise, for the 2nd fraction, since 5 × 81 = 405,
8/5 = 8 × 81/5 × 81 = 648/405 - Add the two like fractions:
90/405 + 648/405 = 90 + 648/405 = 738/405 - 738/405 simplified gives 82/45
- So, 18/81 + 8/5 = 82/45
In mixed form: 137/45
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/81+8/5 18/81+16/5 18/81+8/10 54/81+8/5 18/81+24/5 18/81+8/15 90/81+8/5 18/81+40/5 18/81+8/25 18/81+56/5 18/81+8/35