Add 84/3 and 21/42
1st number: 28 0/3, 2nd number: 21/42
84/3 + 21/42 is 57/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 42 is 42
Next, find the equivalent fraction of both fractional numbers with denominator 42 - For the 1st fraction, since 3 × 14 = 42,
84/3 = 84 × 14/3 × 14 = 1176/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
21/42 = 21 × 1/42 × 1 = 21/42 - Add the two like fractions:
1176/42 + 21/42 = 1176 + 21/42 = 1197/42 - 1197/42 simplified gives 57/2
- So, 84/3 + 21/42 = 57/2
In mixed form: 281/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/6+21/42 84/3+21/84 84/3+63/42 84/9+21/42 84/15+21/42 84/21+21/42