Add 21/42 and 3/14
21/42 + 3/14 is 5/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 14 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 42 × 1 = 42,
21/42 = 21 × 1/42 × 1 = 21/42 - Likewise, for the 2nd fraction, since 14 × 3 = 42,
3/14 = 3 × 3/14 × 3 = 9/42 - Add the two like fractions:
21/42 + 9/42 = 21 + 9/42 = 30/42 - 30/42 simplified gives 5/7
- So, 21/42 + 3/14 = 5/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42+6/14 21/84+3/14 21/42+3/28 63/42+3/14 21/42+9/14 21/42+3/42 21/42+15/14 21/42+3/70 21/42+21/14 21/42+3/98