Add 28/21 and 15/36
1st number: 1 7/21, 2nd number: 15/36
28/21 + 15/36 is 7/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 36 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 21 × 12 = 252,
28/21 = 28 × 12/21 × 12 = 336/252 - Likewise, for the 2nd fraction, since 36 × 7 = 252,
15/36 = 15 × 7/36 × 7 = 105/252 - Add the two like fractions:
336/252 + 105/252 = 336 + 105/252 = 441/252 - 441/252 simplified gives 7/4
- So, 28/21 + 15/36 = 7/4
In mixed form: 13/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/21+15/36 28/21+30/36 28/42+15/36 28/21+15/72 84/21+15/36 28/21+45/36 28/63+15/36 28/21+75/36