Add 21/18 and 63/24
1st number: 1 3/18, 2nd number: 2 15/24
21/18 + 63/24 is 91/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 24 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 18 × 4 = 72,
21/18 = 21 × 4/18 × 4 = 84/72 - Likewise, for the 2nd fraction, since 24 × 3 = 72,
63/24 = 63 × 3/24 × 3 = 189/72 - Add the two like fractions:
84/72 + 189/72 = 84 + 189/72 = 273/72 - 273/72 simplified gives 91/24
- So, 21/18 + 63/24 = 91/24
In mixed form: 319/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/18+63/24 21/36+63/24 21/18+63/48 63/18+63/24 21/54+63/24 21/18+63/72 21/90+63/24