Add 21/28 and 28/12
1st number: 21/28, 2nd number: 2 4/12
21/28 + 28/12 is 37/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 28 × 3 = 84,
21/28 = 21 × 3/28 × 3 = 63/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
28/12 = 28 × 7/12 × 7 = 196/84 - Add the two like fractions:
63/84 + 196/84 = 63 + 196/84 = 259/84 - 259/84 simplified gives 37/12
- So, 21/28 + 28/12 = 37/12
In mixed form: 31/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/28+28/12 21/28+56/12 21/56+28/12 21/28+28/24 63/28+28/12 21/28+84/12 21/84+28/12 21/28+28/36 21/28+28/60 21/28+28/84