Add 10/20 and 9/81
10/20 + 9/81 is 11/18.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 81 is 1620
Next, find the equivalent fraction of both fractional numbers with denominator 1620 - For the 1st fraction, since 20 × 81 = 1620,
10/20 = 10 × 81/20 × 81 = 810/1620 - Likewise, for the 2nd fraction, since 81 × 20 = 1620,
9/81 = 9 × 20/81 × 20 = 180/1620 - Add the two like fractions:
810/1620 + 180/1620 = 810 + 180/1620 = 990/1620 - 990/1620 simplified gives 11/18
- So, 10/20 + 9/81 = 11/18
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20+18/81 10/40+9/81 30/20+9/81 10/20+27/81 10/60+9/81 50/20+9/81 10/20+45/81 70/20+9/81 10/20+63/81