Add 18/90 and 2/81
18/90 + 2/81 is 91/405.
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,
18/90 = 18 × 9/90 × 9 = 162/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
2/81 = 2 × 10/81 × 10 = 20/810 - Add the two like fractions:
162/810 + 20/810 = 162 + 20/810 = 182/810 - 182/810 simplified gives 91/405
- So, 18/90 + 2/81 = 91/405
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/90+2/81 18/90+4/81 54/90+2/81 18/90+6/81 18/90+10/81 18/90+14/81