Add 3/20 and 21/56
3/20 + 21/56 is 21/40.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 56 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 20 × 14 = 280,
3/20 = 3 × 14/20 × 14 = 42/280 - Likewise, for the 2nd fraction, since 56 × 5 = 280,
21/56 = 21 × 5/56 × 5 = 105/280 - Add the two like fractions:
42/280 + 105/280 = 42 + 105/280 = 147/280 - 147/280 simplified gives 21/40
- So, 3/20 + 21/56 = 21/40
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 6/20+21/56 3/20+42/56 3/40+21/56 9/20+21/56 3/20+63/56 3/60+21/56 15/20+21/56 21/20+21/56