Add 21/8 and 2/20
1st number: 2 5/8, 2nd number: 2/20
21/8 + 2/20 is 109/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 20 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 8 × 5 = 40,
21/8 = 21 × 5/8 × 5 = 105/40 - Likewise, for the 2nd fraction, since 20 × 2 = 40,
2/20 = 2 × 2/20 × 2 = 4/40 - Add the two like fractions:
105/40 + 4/40 = 105 + 4/40 = 109/40 - So, 21/8 + 2/20 = 109/40
In mixed form: 229/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8+2/20 21/8+4/20 21/16+2/20 21/8+2/40 63/8+2/20 21/8+6/20 21/24+2/20 21/8+2/60 21/8+10/20 21/40+2/20 21/8+14/20 21/56+2/20