Add 18/28 and 42/40
1st number: 18/28, 2nd number: 1 2/40
18/28 + 42/40 is 237/140.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 28 and 40 is 280
Next, find the equivalent fraction of both fractional numbers with denominator 280 - For the 1st fraction, since 28 × 10 = 280,
18/28 = 18 × 10/28 × 10 = 180/280 - Likewise, for the 2nd fraction, since 40 × 7 = 280,
42/40 = 42 × 7/40 × 7 = 294/280 - Add the two like fractions:
180/280 + 294/280 = 180 + 294/280 = 474/280 - 474/280 simplified gives 237/140
- So, 18/28 + 42/40 = 237/140
In mixed form: 197/140
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 36/28+42/40 18/28+84/40 18/56+42/40 18/28+42/80 54/28+42/40 18/84+42/40 90/28+42/40