Add 90/81 and 10/5
1st number: 1 9/81, 2nd number: 2 0/5
90/81 + 10/5 is 28/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 5 is 405
Next, find the equivalent fraction of both fractional numbers with denominator 405 - For the 1st fraction, since 81 × 5 = 405,
90/81 = 90 × 5/81 × 5 = 450/405 - Likewise, for the 2nd fraction, since 5 × 81 = 405,
10/5 = 10 × 81/5 × 81 = 810/405 - Add the two like fractions:
450/405 + 810/405 = 450 + 810/405 = 1260/405 - 1260/405 simplified gives 28/9
- So, 90/81 + 10/5 = 28/9
In mixed form: 31/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/81+20/5 90/81+30/5 90/81+10/15 90/81+50/5 90/81+10/25 90/81+70/5 90/81+10/35