Add 40/21 and 28/56
1st number: 1 19/21, 2nd number: 28/56
40/21 + 28/56 is 101/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 56 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 21 × 8 = 168,
40/21 = 40 × 8/21 × 8 = 320/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
28/56 = 28 × 3/56 × 3 = 84/168 - Add the two like fractions:
320/168 + 84/168 = 320 + 84/168 = 404/168 - 404/168 simplified gives 101/42
- So, 40/21 + 28/56 = 101/42
In mixed form: 217/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/21+28/56 40/42+28/56 40/21+84/56 40/63+28/56