Add 21/84 and 20/3
1st number: 21/84, 2nd number: 6 2/3
21/84 + 20/3 is 83/12.
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,
20/3 = 20 × 28/3 × 28 = 560/84 - Add the two like fractions:
21/84 + 560/84 = 21 + 560/84 = 581/84 - 581/84 simplified gives 83/12
- So, 21/84 + 20/3 = 83/12
In mixed form: 611/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/84+20/3 21/84+40/3 21/84+20/6 63/84+20/3 21/84+60/3 21/84+20/9 21/84+20/15 21/84+20/21