Add 4/5 and 21/56
4/5 + 21/56 is 47/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 5 and 56 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 5 × 56 = 280,
4/5 = 4 × 56/5 × 56 = 224/280 - Likewise, for the 2nd fraction, since 56 × 5 = 280,
21/56 = 21 × 5/56 × 5 = 105/280 - Add the two like fractions:
224/280 + 105/280 = 224 + 105/280 = 329/280 - 329/280 simplified gives 47/40
- So, 4/5 + 21/56 = 47/40
In mixed form: 17/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 8/5+21/56 4/5+42/56 4/10+21/56 12/5+21/56 4/5+63/56 4/15+21/56 20/5+21/56 4/25+21/56 28/5+21/56 4/35+21/56