Add 40/15 and 18/28
1st number: 2 10/15, 2nd number: 18/28
40/15 + 18/28 is 139/42.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 15 and 28 is 420
Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 15 × 28 = 420,
40/15 = 40 × 28/15 × 28 = 1120/420 - Likewise, for the 2nd fraction, since 28 × 15 = 420,
18/28 = 18 × 15/28 × 15 = 270/420 - Add the two like fractions:
1120/420 + 270/420 = 1120 + 270/420 = 1390/420 - 1390/420 simplified gives 139/42
- So, 40/15 + 18/28 = 139/42
In mixed form: 313/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 80/15+18/28 40/15+36/28 40/30+18/28 40/15+18/56 40/15+54/28 40/45+18/28 40/15+18/84 40/15+90/28 40/75+18/28