Add 5/21 and 28/56
5/21 + 28/56 is 31/42.
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,
5/21 = 5 × 8/21 × 8 = 40/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
28/56 = 28 × 3/56 × 3 = 84/168 - Add the two like fractions:
40/168 + 84/168 = 40 + 84/168 = 124/168 - 124/168 simplified gives 31/42
- So, 5/21 + 28/56 = 31/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+28/56 5/42+28/56 15/21+28/56 5/21+84/56 5/63+28/56 25/21+28/56 35/21+28/56