Add 8/20 and 21/8
1st number: 8/20, 2nd number: 2 5/8
8/20 + 21/8 is 121/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 8 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 20 × 2 = 40,
8/20 = 8 × 2/20 × 2 = 16/40 - Likewise, for the 2nd fraction, since 8 × 5 = 40,
21/8 = 21 × 5/8 × 5 = 105/40 - Add the two like fractions:
16/40 + 105/40 = 16 + 105/40 = 121/40 - So, 8/20 + 21/8 = 121/40
In mixed form: 31/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 16/20+21/8 8/20+42/8 8/40+21/8 8/20+21/16 24/20+21/8 8/20+63/8 8/60+21/8 8/20+21/24 40/20+21/8 8/20+21/40 56/20+21/8 8/20+21/56