Add 42/56 and 6/21
42/56 + 6/21 is 29/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 21 is 168
Next, find the equivalent fraction of both fractional numbers with denominator 168 - For the 1st fraction, since 56 × 3 = 168,
42/56 = 42 × 3/56 × 3 = 126/168 - Likewise, for the 2nd fraction, since 21 × 8 = 168,
6/21 = 6 × 8/21 × 8 = 48/168 - Add the two like fractions:
126/168 + 48/168 = 126 + 48/168 = 174/168 - 174/168 simplified gives 29/28
- So, 42/56 + 6/21 = 29/28
In mixed form: 11/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/56+6/21 42/56+12/21 42/56+6/42 42/56+18/21 42/56+6/63 42/56+30/21 42/56+42/21