Add 10/15 and 90/81
1st number: 10/15, 2nd number: 1 9/81
10/15 + 90/81 is 16/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 81 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 15 × 27 = 405,
10/15 = 10 × 27/15 × 27 = 270/405 - Likewise, for the 2nd fraction, since 81 × 5 = 405,
90/81 = 90 × 5/81 × 5 = 450/405 - Add the two like fractions:
270/405 + 450/405 = 270 + 450/405 = 720/405 - 720/405 simplified gives 16/9
- So, 10/15 + 90/81 = 16/9
In mixed form: 17/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 20/15+90/81 10/30+90/81 30/15+90/81 10/45+90/81 50/15+90/81 10/75+90/81 70/15+90/81