Add 21/8 and 27/40
1st number: 2 5/8, 2nd number: 27/40
21/8 + 27/40 is 33/10.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 8 and 40 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 40 × 1 = 40,
27/40 = 27 × 1/40 × 1 = 27/40 - Add the two like fractions:
105/40 + 27/40 = 105 + 27/40 = 132/40 - 132/40 simplified gives 33/10
- So, 21/8 + 27/40 = 33/10
In mixed form: 33/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/8+27/40 21/8+54/40 21/16+27/40 21/8+27/80 63/8+27/40 21/8+81/40 21/24+27/40 21/40+27/40 21/56+27/40