Add 21/84 and 9/3
1st number: 21/84, 2nd number: 3 0/3
21/84 + 9/3 is 13/4.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 84 and 3 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 84 × 1 = 84,
21/84 = 21 × 1/84 × 1 = 21/84 - Likewise, for the 2nd fraction, since 3 × 28 = 84,
9/3 = 9 × 28/3 × 28 = 252/84 - Add the two like fractions:
21/84 + 252/84 = 21 + 252/84 = 273/84 - 273/84 simplified gives 13/4
- So, 21/84 + 9/3 = 13/4
In mixed form: 31/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+9/3 21/84+18/3 21/84+9/6 63/84+9/3 21/84+27/3 21/84+45/3 21/84+9/15 21/84+63/3 21/84+9/21