Add 5/21 and 9/12
5/21 + 9/12 is 83/84.
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,
9/12 = 9 × 7/12 × 7 = 63/84 - Add the two like fractions:
20/84 + 63/84 = 20 + 63/84 = 83/84 - So, 5/21 + 9/12 = 83/84
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/21+9/12 5/21+18/12 5/42+9/12 5/21+9/24 15/21+9/12 5/21+27/12 5/63+9/12 5/21+9/36 25/21+9/12 5/21+45/12 5/21+9/60 35/21+9/12 5/21+63/12 5/21+9/84