Add 21/8 and 27/20
1st number: 2 5/8, 2nd number: 1 7/20
21/8 + 27/20 is 159/40.
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,
27/20 = 27 × 2/20 × 2 = 54/40 - Add the two like fractions:
105/40 + 54/40 = 105 + 54/40 = 159/40 - So, 21/8 + 27/20 = 159/40
In mixed form: 339/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8+27/20 21/8+54/20 21/16+27/20 21/8+27/40 63/8+27/20 21/8+81/20 21/24+27/20 21/8+27/60 21/40+27/20 21/56+27/20