Add 21/81 and 90/10
1st number: 21/81, 2nd number: 9 0/10
21/81 + 90/10 is 250/27.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 81 and 10 is 810
Next, find the equivalent fraction of both fractional numbers with denominator 810 - For the 1st fraction, since 81 × 10 = 810,
21/81 = 21 × 10/81 × 10 = 210/810 - Likewise, for the 2nd fraction, since 10 × 81 = 810,
90/10 = 90 × 81/10 × 81 = 7290/810 - Add the two like fractions:
210/810 + 7290/810 = 210 + 7290/810 = 7500/810 - 7500/810 simplified gives 250/27
- So, 21/81 + 90/10 = 250/27
In mixed form: 97/27
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/81+90/10 21/81+90/20 63/81+90/10 21/81+90/30 21/81+90/50 21/81+90/70