Add 4/21 and 42/84
4/21 + 42/84 is 29/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
4/21 = 4 × 4/21 × 4 = 16/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
42/84 = 42 × 1/84 × 1 = 42/84 - Add the two like fractions:
16/84 + 42/84 = 16 + 42/84 = 58/84 - 58/84 simplified gives 29/42
- So, 4/21 + 42/84 = 29/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/21+42/84 4/42+42/84 12/21+42/84 4/63+42/84 20/21+42/84 28/21+42/84