Add 7/2 and 21/90
1st number: 3 1/2, 2nd number: 21/90
7/2 + 21/90 is 56/15.
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,
7/2 = 7 × 45/2 × 45 = 315/90 - Likewise, for the 2nd fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Add the two like fractions:
315/90 + 21/90 = 315 + 21/90 = 336/90 - 336/90 simplified gives 56/15
- So, 7/2 + 21/90 = 56/15
In mixed form: 311/15
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/2+21/90 7/2+42/90 7/4+21/90 21/2+21/90 7/2+63/90 7/6+21/90 35/2+21/90 7/10+21/90 49/2+21/90 7/14+21/90