Add 40/3 and 28/21
1st number: 13 1/3, 2nd number: 1 7/21
40/3 + 28/21 is 44/3.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 21 is 21
Next, find the equivalent fraction of both fractional numbers with denominator 21 - For the 1st fraction, since 3 × 7 = 21,
40/3 = 40 × 7/3 × 7 = 280/21 - Likewise, for the 2nd fraction, since 21 × 1 = 21,
28/21 = 28 × 1/21 × 1 = 28/21 - Add the two like fractions:
280/21 + 28/21 = 280 + 28/21 = 308/21 - 308/21 simplified gives 44/3
- So, 40/3 + 28/21 = 44/3
In mixed form: 142/3
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/3+28/21 40/3+56/21 40/6+28/21 40/3+28/42 40/3+84/21 40/9+28/21 40/3+28/63 40/15+28/21 40/21+28/21