Add 5/20 and 28/42
5/20 + 28/42 is 11/12.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 42 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 20 × 21 = 420,
5/20 = 5 × 21/20 × 21 = 105/420 - Likewise, for the 2nd fraction, since 42 × 10 = 420,
28/42 = 28 × 10/42 × 10 = 280/420 - Add the two like fractions:
105/420 + 280/420 = 105 + 280/420 = 385/420 - 385/420 simplified gives 11/12
- So, 5/20 + 28/42 = 11/12
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 10/20+28/42 5/20+56/42 5/40+28/42 5/20+28/84 15/20+28/42 5/20+84/42 5/60+28/42 25/20+28/42 35/20+28/42