Add 21/42 and 2/84
21/42 + 2/84 is 11/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 84 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 42 × 2 = 84,
21/42 = 21 × 2/42 × 2 = 42/84 - Likewise, for the 2nd fraction, since 84 × 1 = 84,
2/84 = 2 × 1/84 × 1 = 2/84 - Add the two like fractions:
42/84 + 2/84 = 42 + 2/84 = 44/84 - 44/84 simplified gives 11/21
- So, 21/42 + 2/84 = 11/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42+4/84 21/84+2/84 63/42+2/84 21/42+6/84 21/42+10/84 21/42+14/84