Add 21/3 and 21/42
1st number: 7 0/3, 2nd number: 21/42
21/3 + 21/42 is 15/2.
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,
21/3 = 21 × 14/3 × 14 = 294/42 - Likewise, for the 2nd fraction, since 42 × 1 = 42,
21/42 = 21 × 1/42 × 1 = 21/42 - Add the two like fractions:
294/42 + 21/42 = 294 + 21/42 = 315/42 - 315/42 simplified gives 15/2
- So, 21/3 + 21/42 = 15/2
In mixed form: 71/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3+21/42 21/6+21/42 21/3+21/84 63/3+21/42 21/3+63/42 21/9+21/42 21/15+21/42