Add 28/2 and 21/90
1st number: 14 0/2, 2nd number: 21/90
28/2 + 21/90 is 427/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 90 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 2 × 45 = 90,
28/2 = 28 × 45/2 × 45 = 1260/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Add the two like fractions:
1260/90 + 21/90 = 1260 + 21/90 = 1281/90 - 1281/90 simplified gives 427/30
- So, 28/2 + 21/90 = 427/30
In mixed form: 147/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/2+21/90 28/2+42/90 28/4+21/90 84/2+21/90 28/2+63/90 28/6+21/90 28/10+21/90 28/14+21/90