Add 8/21 and 42/56
8/21 + 42/56 is 95/84.
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,
8/21 = 8 × 8/21 × 8 = 64/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
42/56 = 42 × 3/56 × 3 = 126/168 - Add the two like fractions:
64/168 + 126/168 = 64 + 126/168 = 190/168 - 190/168 simplified gives 95/84
- So, 8/21 + 42/56 = 95/84
In mixed form: 111/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/21+42/56 8/21+84/56 8/42+42/56 24/21+42/56 8/63+42/56 40/21+42/56 56/21+42/56