Add 54/20 and 42/28
1st number: 2 14/20, 2nd number: 1 14/28
54/20 + 42/28 is 21/5.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 20 and 28 is 140
Next, find the equivalent fraction of both fractional numbers with denominator 140 - For the 1st fraction, since 20 × 7 = 140,
54/20 = 54 × 7/20 × 7 = 378/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
42/28 = 42 × 5/28 × 5 = 210/140 - Add the two like fractions:
378/140 + 210/140 = 378 + 210/140 = 588/140 - 588/140 simplified gives 21/5
- So, 54/20 + 42/28 = 21/5
In mixed form: 41/5
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 54/20+84/28 54/40+42/28 54/20+42/56 54/60+42/28 54/20+42/84