Add 9/90 and 21/12
1st number: 9/90, 2nd number: 1 9/12
9/90 + 21/12 is 37/20.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 90 and 12 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 90 × 2 = 180,
9/90 = 9 × 2/90 × 2 = 18/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
21/12 = 21 × 15/12 × 15 = 315/180 - Add the two like fractions:
18/180 + 315/180 = 18 + 315/180 = 333/180 - 333/180 simplified gives 37/20
- So, 9/90 + 21/12 = 37/20
In mixed form: 117/20
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 18/90+21/12 9/90+42/12 9/90+21/24 27/90+21/12 9/90+63/12 9/90+21/36 45/90+21/12 9/90+21/60 63/90+21/12 9/90+21/84