Add 27/90 and 18/81
27/90 + 18/81 is 47/90.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 81 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 90 × 9 = 810,
27/90 = 27 × 9/90 × 9 = 243/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
18/81 = 18 × 10/81 × 10 = 180/810 - Add the two like fractions:
243/810 + 180/810 = 243 + 180/810 = 423/810 - 423/810 simplified gives 47/90
- So, 27/90 + 18/81 = 47/90
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/90+18/81 27/90+36/81 81/90+18/81 27/90+54/81 27/90+90/81