Add 15/56 and 21/5
1st number: 15/56, 2nd number: 4 1/5
15/56 + 21/5 is 1251/280.
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,
15/56 = 15 × 5/56 × 5 = 75/280 - Likewise, for the 2nd fraction, since 5 × 56 = 280,
21/5 = 21 × 56/5 × 56 = 1176/280 - Add the two like fractions:
75/280 + 1176/280 = 75 + 1176/280 = 1251/280 - So, 15/56 + 21/5 = 1251/280
In mixed form: 4131/280
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/56+21/5 15/56+42/5 15/56+21/10 45/56+21/5 15/56+63/5 15/56+21/15 75/56+21/5 15/56+21/25 15/56+21/35