Add 21/12 and 48/90
1st number: 1 9/12, 2nd number: 48/90
21/12 + 48/90 is 137/60.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 90 is 180
Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 12 × 15 = 180,
21/12 = 21 × 15/12 × 15 = 315/180 - Likewise, for the 2nd fraction, since 90 × 2 = 180,
48/90 = 48 × 2/90 × 2 = 96/180 - Add the two like fractions:
315/180 + 96/180 = 315 + 96/180 = 411/180 - 411/180 simplified gives 137/60
- So, 21/12 + 48/90 = 137/60
In mixed form: 217/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+48/90 21/12+96/90 21/24+48/90 63/12+48/90 21/36+48/90 21/60+48/90 21/84+48/90