Add 20/90 and 9/81
20/90 + 9/81 is 1/3.
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,
20/90 = 20 × 9/90 × 9 = 180/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
9/81 = 9 × 10/81 × 10 = 90/810 - Add the two like fractions:
180/810 + 90/810 = 180 + 90/810 = 270/810 - 270/810 simplified gives 1/3
- So, 20/90 + 9/81 = 1/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/90+9/81 20/90+18/81 60/90+9/81 20/90+27/81 20/90+45/81 20/90+63/81