Add 21/63 and 28/18
1st number: 21/63, 2nd number: 1 10/18
21/63 + 28/18 is 17/9.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 63 and 18 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 63 × 2 = 126,
21/63 = 21 × 2/63 × 2 = 42/126 - Likewise, for the 2nd fraction, since 18 × 7 = 126,
28/18 = 28 × 7/18 × 7 = 196/126 - Add the two like fractions:
42/126 + 196/126 = 42 + 196/126 = 238/126 - 238/126 simplified gives 17/9
- So, 21/63 + 28/18 = 17/9
In mixed form: 18/9
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/63+28/18 21/63+56/18 21/63+28/36 21/63+84/18 21/63+28/54 21/63+28/90