Add 21/9 and 28/10
1st number: 2 3/9, 2nd number: 2 8/10
21/9 + 28/10 is 77/15.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 10 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 9 × 10 = 90,
21/9 = 21 × 10/9 × 10 = 210/90 - Likewise, for the 2nd fraction, since 10 × 9 = 90,
28/10 = 28 × 9/10 × 9 = 252/90 - Add the two like fractions:
210/90 + 252/90 = 210 + 252/90 = 462/90 - 462/90 simplified gives 77/15
- So, 21/9 + 28/10 = 77/15
In mixed form: 52/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9+28/10 21/9+56/10 21/18+28/10 21/9+28/20 63/9+28/10 21/9+84/10 21/27+28/10 21/9+28/30 21/45+28/10 21/9+28/50 21/63+28/10 21/9+28/70