Add 45/20 and 42/28
1st number: 2 5/20, 2nd number: 1 14/28
45/20 + 42/28 is 15/4.
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,
45/20 = 45 × 7/20 × 7 = 315/140 - Likewise, for the 2nd fraction, since 28 × 5 = 140,
42/28 = 42 × 5/28 × 5 = 210/140 - Add the two like fractions:
315/140 + 210/140 = 315 + 210/140 = 525/140 - 525/140 simplified gives 15/4
- So, 45/20 + 42/28 = 15/4
In mixed form: 33/4
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/20+42/28 45/20+84/28 45/40+42/28 45/20+42/56 45/60+42/28 45/20+42/84