Add 21/3 and 56/72
1st number: 7 0/3, 2nd number: 56/72
21/3 + 56/72 is 70/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 72 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 3 × 24 = 72,
21/3 = 21 × 24/3 × 24 = 504/72 - Likewise, for the 2nd fraction, since 72 × 1 = 72,
56/72 = 56 × 1/72 × 1 = 56/72 - Add the two like fractions:
504/72 + 56/72 = 504 + 56/72 = 560/72 - 560/72 simplified gives 70/9
- So, 21/3 + 56/72 = 70/9
In mixed form: 77/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3+56/72 21/6+56/72 63/3+56/72 21/9+56/72 21/15+56/72