Add 28/18 and 15/40
1st number: 1 10/18, 2nd number: 15/40
28/18 + 15/40 is 139/72.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 40 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 18 × 20 = 360,
28/18 = 28 × 20/18 × 20 = 560/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
15/40 = 15 × 9/40 × 9 = 135/360 - Add the two like fractions:
560/360 + 135/360 = 560 + 135/360 = 695/360 - 695/360 simplified gives 139/72
- So, 28/18 + 15/40 = 139/72
In mixed form: 167/72
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 56/18+15/40 28/18+30/40 28/36+15/40 28/18+15/80 84/18+15/40 28/18+45/40 28/54+15/40 28/18+75/40 28/90+15/40