Add 21/36 and 42/28
1st number: 21/36, 2nd number: 1 14/28
21/36 + 42/28 is 25/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 28 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
21/36 = 21 × 7/36 × 7 = 147/252 - Likewise, for the 2nd fraction, since 28 × 9 = 252,
42/28 = 42 × 9/28 × 9 = 378/252 - Add the two like fractions:
147/252 + 378/252 = 147 + 378/252 = 525/252 - 525/252 simplified gives 25/12
- So, 21/36 + 42/28 = 25/12
In mixed form: 21/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/36+42/28 21/36+84/28 21/72+42/28 21/36+42/56 63/36+42/28 21/36+42/84