Add 15/18 and 42/40
1st number: 15/18, 2nd number: 1 2/40
15/18 + 42/40 is 113/60.
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,
42/40 = 42 × 9/40 × 9 = 378/360 - Add the two like fractions:
300/360 + 378/360 = 300 + 378/360 = 678/360 - 678/360 simplified gives 113/60
- So, 15/18 + 42/40 = 113/60
In mixed form: 153/60
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18+42/40 15/18+84/40 15/36+42/40 15/18+42/80 45/18+42/40 15/54+42/40 75/18+42/40 15/90+42/40