Add 7/12 and 3/21
7/12 + 3/21 is 61/84.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 12 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 12 × 7 = 84,
7/12 = 7 × 7/12 × 7 = 49/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
3/21 = 3 × 4/21 × 4 = 12/84 - Add the two like fractions:
49/84 + 12/84 = 49 + 12/84 = 61/84 - So, 7/12 + 3/21 = 61/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/12+3/21 7/12+6/21 7/24+3/21 7/12+3/42 21/12+3/21 7/12+9/21 7/36+3/21 7/12+3/63 35/12+3/21 7/12+15/21 7/60+3/21 49/12+3/21 7/84+3/21