Add 6/21 and 3/12
6/21 + 3/12 is 15/28.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 12 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
6/21 = 6 × 4/21 × 4 = 24/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
3/12 = 3 × 7/12 × 7 = 21/84 - Add the two like fractions:
24/84 + 21/84 = 24 + 21/84 = 45/84 - 45/84 simplified gives 15/28
- So, 6/21 + 3/12 = 15/28
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 12/21+3/12 6/21+6/12 6/42+3/12 6/21+3/24 18/21+3/12 6/21+9/12 6/63+3/12 6/21+3/36 30/21+3/12 6/21+15/12 6/21+3/60 42/21+3/12 6/21+21/12 6/21+3/84