Add 15/40 and 12/18
15/40 + 12/18 is 25/24.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 40 and 18 is 360
Next, find the equivalent fraction of both fractional numbers with denominator 360 - For the 1st fraction, since 40 × 9 = 360,
15/40 = 15 × 9/40 × 9 = 135/360 - Likewise, for the 2nd fraction, since 18 × 20 = 360,
12/18 = 12 × 20/18 × 20 = 240/360 - Add the two like fractions:
135/360 + 240/360 = 135 + 240/360 = 375/360 - 375/360 simplified gives 25/24
- So, 15/40 + 12/18 = 25/24
In mixed form: 11/24
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/40+12/18 15/40+24/18 15/80+12/18 15/40+12/36 45/40+12/18 15/40+36/18 15/40+12/54 75/40+12/18 15/40+60/18 15/40+12/90 15/40+84/18