Add 90/9 and 21/28
1st number: 10 0/9, 2nd number: 21/28
90/9 + 21/28 is 43/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 28 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 9 × 28 = 252,
90/9 = 90 × 28/9 × 28 = 2520/252 - Likewise, for the 2nd fraction, since 28 × 9 = 252,
21/28 = 21 × 9/28 × 9 = 189/252 - Add the two like fractions:
2520/252 + 189/252 = 2520 + 189/252 = 2709/252 - 2709/252 simplified gives 43/4
- So, 90/9 + 21/28 = 43/4
In mixed form: 103/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/9+42/28 90/18+21/28 90/9+21/56 90/9+63/28 90/27+21/28 90/9+21/84 90/45+21/28 90/63+21/28