Add 21/56 and 18/5
1st number: 21/56, 2nd number: 3 3/5
21/56 + 18/5 is 159/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 56 and 5 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 56 × 5 = 280,
21/56 = 21 × 5/56 × 5 = 105/280 - Likewise, for the 2nd fraction, since 5 × 56 = 280,
18/5 = 18 × 56/5 × 56 = 1008/280 - Add the two like fractions:
105/280 + 1008/280 = 105 + 1008/280 = 1113/280 - 1113/280 simplified gives 159/40
- So, 21/56 + 18/5 = 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: 42/56+18/5 21/56+36/5 21/56+18/10 63/56+18/5 21/56+54/5 21/56+18/15 21/56+90/5 21/56+18/25 21/56+18/35