Add 21/90 and 15/5
1st number: 21/90, 2nd number: 3 0/5
21/90 + 15/5 is 97/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 5 is 90
Next, find the equivalent fraction of both fractional numbers with denominator 90 - For the 1st fraction, since 90 × 1 = 90,
21/90 = 21 × 1/90 × 1 = 21/90 - Likewise, for the 2nd fraction, since 5 × 18 = 90,
15/5 = 15 × 18/5 × 18 = 270/90 - Add the two like fractions:
21/90 + 270/90 = 21 + 270/90 = 291/90 - 291/90 simplified gives 97/30
- So, 21/90 + 15/5 = 97/30
In mixed form: 37/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90+15/5 21/90+30/5 21/90+15/10 63/90+15/5 21/90+45/5 21/90+75/5 21/90+15/25 21/90+15/35