Add 72/36 and 28/21
1st number: 2 0/36, 2nd number: 1 7/21
72/36 + 28/21 is 10/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 36 and 21 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 36 × 7 = 252,
72/36 = 72 × 7/36 × 7 = 504/252 - Likewise, for the 2nd fraction, since 21 × 12 = 252,
28/21 = 28 × 12/21 × 12 = 336/252 - Add the two like fractions:
504/252 + 336/252 = 504 + 336/252 = 840/252 - 840/252 simplified gives 10/3
- So, 72/36 + 28/21 = 10/3
In mixed form: 31/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/36+56/21 72/36+28/42 72/36+84/21 72/36+28/63