Add 84/4 and 20/21
1st number: 21 0/4, 2nd number: 20/21
84/4 + 20/21 is 461/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 4 and 21 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 4 × 21 = 84,
84/4 = 84 × 21/4 × 21 = 1764/84 - Likewise, for the 2nd fraction, since 21 × 4 = 84,
20/21 = 20 × 4/21 × 4 = 80/84 - Add the two like fractions:
1764/84 + 80/84 = 1764 + 80/84 = 1844/84 - 1844/84 simplified gives 461/21
- So, 84/4 + 20/21 = 461/21
In mixed form: 2120/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/4+40/21 84/8+20/21 84/4+20/42 84/4+60/21 84/12+20/21 84/4+20/63 84/20+20/21 84/28+20/21