Add 54/21 and 84/4
1st number: 2 12/21, 2nd number: 21 0/4
54/21 + 84/4 is 165/7.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 21 and 4 is 84
Next, find the equivalent fraction of both fractional numbers with denominator 84 - For the 1st fraction, since 21 × 4 = 84,
54/21 = 54 × 4/21 × 4 = 216/84 - Likewise, for the 2nd fraction, since 4 × 21 = 84,
84/4 = 84 × 21/4 × 21 = 1764/84 - Add the two like fractions:
216/84 + 1764/84 = 216 + 1764/84 = 1980/84 - 1980/84 simplified gives 165/7
- So, 54/21 + 84/4 = 165/7
In mixed form: 234/7
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/42+84/4 54/21+84/8 54/63+84/4 54/21+84/12 54/21+84/20 54/21+84/28