Add 21/12 and 27/36
1st number: 1 9/12, 2nd number: 27/36
21/12 + 27/36 is 5/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 36 is 36
Next, find the equivalent fraction of both fractional numbers with denominator 36 - For the 1st fraction, since 12 × 3 = 36,
21/12 = 21 × 3/12 × 3 = 63/36 - Likewise, for the 2nd fraction, since 36 × 1 = 36,
27/36 = 27 × 1/36 × 1 = 27/36 - Add the two like fractions:
63/36 + 27/36 = 63 + 27/36 = 90/36 - 90/36 simplified gives 5/2
- So, 21/12 + 27/36 = 5/2
In mixed form: 21/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/12+27/36 21/12+54/36 21/24+27/36 21/12+27/72 63/12+27/36 21/12+81/36 21/36+27/36 21/60+27/36 21/84+27/36