Add 72/2 and 28/21
1st number: 36 0/2, 2nd number: 1 7/21
72/2 + 28/21 is 112/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 2 and 21 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 2 × 21 = 42,
72/2 = 72 × 21/2 × 21 = 1512/42 - Likewise, for the 2nd fraction, since 21 × 2 = 42,
28/21 = 28 × 2/21 × 2 = 56/42 - Add the two like fractions:
1512/42 + 56/42 = 1512 + 56/42 = 1568/42 - 1568/42 simplified gives 112/3
- So, 72/2 + 28/21 = 112/3
In mixed form: 371/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 72/2+56/21 72/4+28/21 72/2+28/42 72/2+84/21 72/6+28/21 72/2+28/63 72/10+28/21 72/14+28/21