Add 7/21 and 2/12
7/21 + 2/12 is 1/2.
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,
7/21 = 7 × 4/21 × 4 = 28/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
2/12 = 2 × 7/12 × 7 = 14/84 - Add the two like fractions:
28/84 + 14/84 = 28 + 14/84 = 42/84 - 42/84 simplified gives 1/2
- So, 7/21 + 2/12 = 1/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 14/21+2/12 7/21+4/12 7/42+2/12 7/21+2/24 7/21+6/12 7/63+2/12 7/21+2/36 35/21+2/12 7/21+10/12 7/21+2/60 49/21+2/12 7/21+14/12 7/21+2/84