Add 15/18 and 21/63
15/18 + 21/63 is 7/6.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 63 is 126
Next, find the equivalent fraction of both fractional numbers with denominator 126 - For the 1st fraction, since 18 × 7 = 126,
15/18 = 15 × 7/18 × 7 = 105/126 - Likewise, for the 2nd fraction, since 63 × 2 = 126,
21/63 = 21 × 2/63 × 2 = 42/126 - Add the two like fractions:
105/126 + 42/126 = 105 + 42/126 = 147/126 - 147/126 simplified gives 7/6
- So, 15/18 + 21/63 = 7/6
In mixed form: 11/6
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18+21/63 15/18+42/63 15/36+21/63 45/18+21/63 15/54+21/63 75/18+21/63 15/90+21/63