Add 21/90 and 27/12
1st number: 21/90, 2nd number: 2 3/12
21/90 + 27/12 is 149/60.
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,
21/90 = 21 × 2/90 × 2 = 42/180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,
27/12 = 27 × 15/12 × 15 = 405/180 - Add the two like fractions:
42/180 + 405/180 = 42 + 405/180 = 447/180 - 447/180 simplified gives 149/60
- So, 21/90 + 27/12 = 149/60
In mixed form: 229/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/90+27/12 21/90+54/12 21/90+27/24 63/90+27/12 21/90+81/12 21/90+27/36 21/90+27/60 21/90+27/84