Add 9/18 and 21/8
1st number: 9/18, 2nd number: 2 5/8
9/18 + 21/8 is 25/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 8 is 72
Next, find the equivalent fraction of both fractional numbers with denominator 72 - For the 1st fraction, since 18 × 4 = 72,
9/18 = 9 × 4/18 × 4 = 36/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
21/8 = 21 × 9/8 × 9 = 189/72 - Add the two like fractions:
36/72 + 189/72 = 36 + 189/72 = 225/72 - 225/72 simplified gives 25/8
- So, 9/18 + 21/8 = 25/8
In mixed form: 31/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 9/18+42/8 9/36+21/8 9/18+21/16 27/18+21/8 9/18+63/8 9/54+21/8 9/18+21/24 45/18+21/8 9/90+21/8 9/18+21/40 63/18+21/8 9/18+21/56