Add 21/42 and 14/20
21/42 + 14/20 is 6/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 42 × 10 = 420,
21/42 = 21 × 10/42 × 10 = 210/420 - Likewise, for the 2nd fraction, since 20 × 21 = 420,
14/20 = 14 × 21/20 × 21 = 294/420 - Add the two like fractions:
210/420 + 294/420 = 210 + 294/420 = 504/420 - 504/420 simplified gives 6/5
- So, 21/42 + 14/20 = 6/5
In mixed form: 11/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 21/42+28/20 21/84+14/20 21/42+14/40 63/42+14/20 21/42+42/20 21/42+14/60 21/42+70/20 21/42+98/20