Add 2/21 and 28/84
2/21 + 28/84 is 3/7.
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,
2/21 = 2 × 4/21 × 4 = 8/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
28/84 = 28 × 1/84 × 1 = 28/84 - Add the two like fractions:
8/84 + 28/84 = 8 + 28/84 = 36/84 - 36/84 simplified gives 3/7
- So, 2/21 + 28/84 = 3/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 4/21+28/84 2/21+56/84 2/42+28/84 6/21+28/84 2/63+28/84 10/21+28/84 14/21+28/84