Add 21/5 and 27/40
1st number: 4 1/5, 2nd number: 27/40
21/5 + 27/40 is 39/8.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 40 is 40
Next, find the equivalent fraction of both fractional numbers with denominator 40 - For the 1st fraction, since 5 × 8 = 40,
21/5 = 21 × 8/5 × 8 = 168/40 - Likewise, for the 2nd fraction, since 40 × 1 = 40,
27/40 = 27 × 1/40 × 1 = 27/40 - Add the two like fractions:
168/40 + 27/40 = 168 + 27/40 = 195/40 - 195/40 simplified gives 39/8
- So, 21/5 + 27/40 = 39/8
In mixed form: 47/8
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 42/5+27/40 21/5+54/40 21/10+27/40 21/5+27/80 63/5+27/40 21/5+81/40 21/15+27/40 21/25+27/40 21/35+27/40