Add 9/90 and 15/81
9/90 + 15/81 is 77/270.
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,
9/90 = 9 × 9/90 × 9 = 81/810 - Likewise, for the 2nd fraction, since 81 × 10 = 810,
15/81 = 15 × 10/81 × 10 = 150/810 - Add the two like fractions:
81/810 + 150/810 = 81 + 150/810 = 231/810 - 231/810 simplified gives 77/270
- So, 9/90 + 15/81 = 77/270
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/90+15/81 9/90+30/81 27/90+15/81 9/90+45/81 45/90+15/81 9/90+75/81 63/90+15/81