Add 5/21 and 2/12
5/21 + 2/12 is 17/42.
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,
5/21 = 5 × 4/21 × 4 = 20/84 - Likewise, for the 2nd fraction, since 12 × 7 = 84,
2/12 = 2 × 7/12 × 7 = 14/84 - Add the two like fractions:
20/84 + 14/84 = 20 + 14/84 = 34/84 - 34/84 simplified gives 17/42
- So, 5/21 + 2/12 = 17/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+2/12 5/21+4/12 5/42+2/12 5/21+2/24 15/21+2/12 5/21+6/12 5/63+2/12 5/21+2/36 25/21+2/12 5/21+10/12 5/21+2/60 35/21+2/12 5/21+14/12 5/21+2/84