Add 21/9 and 12/84
1st number: 2 3/9, 2nd number: 12/84
21/9 + 12/84 is 52/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 9 and 84 is 252
Next, find the equivalent fraction of both fractional numbers with denominator 252 - For the 1st fraction, since 9 × 28 = 252,
21/9 = 21 × 28/9 × 28 = 588/252 - Likewise, for the 2nd fraction, since 84 × 3 = 252,
12/84 = 12 × 3/84 × 3 = 36/252 - Add the two like fractions:
588/252 + 36/252 = 588 + 36/252 = 624/252 - 624/252 simplified gives 52/21
- So, 21/9 + 12/84 = 52/21
In mixed form: 210/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/9+12/84 21/9+24/84 21/18+12/84 63/9+12/84 21/9+36/84 21/27+12/84 21/9+60/84 21/45+12/84 21/63+12/84