Add 20/18 and 21/8
1st number: 1 2/18, 2nd number: 2 5/8
20/18 + 21/8 is 269/72.
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,
20/18 = 20 × 4/18 × 4 = 80/72 - Likewise, for the 2nd fraction, since 8 × 9 = 72,
21/8 = 21 × 9/8 × 9 = 189/72 - Add the two like fractions:
80/72 + 189/72 = 80 + 189/72 = 269/72 - So, 20/18 + 21/8 = 269/72
In mixed form: 353/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 40/18+21/8 20/18+42/8 20/36+21/8 20/18+21/16 60/18+21/8 20/18+63/8 20/54+21/8 20/18+21/24 20/90+21/8 20/18+21/40 20/18+21/56