Add 4/21 and 42/56
4/21 + 42/56 is 79/84.
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,
4/21 = 4 × 8/21 × 8 = 32/168 - Likewise, for the 2nd fraction, since 56 × 3 = 168,
42/56 = 42 × 3/56 × 3 = 126/168 - Add the two like fractions:
32/168 + 126/168 = 32 + 126/168 = 158/168 - 158/168 simplified gives 79/84
- So, 4/21 + 42/56 = 79/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21+42/56 4/21+84/56 4/42+42/56 12/21+42/56 4/63+42/56 20/21+42/56 28/21+42/56