Add 15/18 and 7/40
15/18 + 7/40 is 121/120.
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,
15/18 = 15 × 20/18 × 20 = 300/360 - Likewise, for the 2nd fraction, since 40 × 9 = 360,
7/40 = 7 × 9/40 × 9 = 63/360 - Add the two like fractions:
300/360 + 63/360 = 300 + 63/360 = 363/360 - 363/360 simplified gives 121/120
- So, 15/18 + 7/40 = 121/120
In mixed form: 11/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18+7/40 15/18+14/40 15/36+7/40 15/18+7/80 45/18+7/40 15/18+21/40 15/54+7/40 75/18+7/40 15/18+35/40 15/90+7/40 15/18+49/40