Add 5/81 and 20/90
5/81 + 20/90 is 23/81.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 90 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 81 × 10 = 810,
5/81 = 5 × 10/81 × 10 = 50/810 - Likewise, for the 2nd fraction, since 90 × 9 = 810,
20/90 = 20 × 9/90 × 9 = 180/810 - Add the two like fractions:
50/810 + 180/810 = 50 + 180/810 = 230/810 - 230/810 simplified gives 23/81
- So, 5/81 + 20/90 = 23/81
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/81+20/90 5/81+40/90 15/81+20/90 5/81+60/90 25/81+20/90 35/81+20/90