Add 21/3 and 63/18
1st number: 7 0/3, 2nd number: 3 9/18
21/3 + 63/18 is 21/2.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 3 and 18 is 18
Next, find the equivalent fraction of both fractional numbers with denominator 18 - For the 1st fraction, since 3 × 6 = 18,
21/3 = 21 × 6/3 × 6 = 126/18 - Likewise, for the 2nd fraction, since 18 × 1 = 18,
63/18 = 63 × 1/18 × 1 = 63/18 - Add the two like fractions:
126/18 + 63/18 = 126 + 63/18 = 189/18 - 189/18 simplified gives 21/2
- So, 21/3 + 63/18 = 21/2
In mixed form: 101/2
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/3+63/18 21/6+63/18 21/3+63/36 63/3+63/18 21/9+63/18 21/3+63/54 21/15+63/18 21/3+63/90