Add 42/20 and 21/14
1st number: 2 2/20, 2nd number: 1 7/14
42/20 + 21/14 is 18/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 14 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
42/20 = 42 × 7/20 × 7 = 294/140 - Likewise, for the 2nd fraction, since 14 × 10 = 140,
21/14 = 21 × 10/14 × 10 = 210/140 - Add the two like fractions:
294/140 + 210/140 = 294 + 210/140 = 504/140 - 504/140 simplified gives 18/5
- So, 42/20 + 21/14 = 18/5
In mixed form: 33/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 84/20+21/14 42/20+42/14 42/40+21/14 42/20+21/28 42/20+63/14 42/60+21/14 42/20+21/42 42/20+21/70 42/20+21/98