Add 30/18 and 42/80
1st number: 1 12/18, 2nd number: 42/80
30/18 + 42/80 is 263/120.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 80 is 720
Next, find the equivalent fraction of both fractional numbers with denominator 720 - For the 1st fraction, since 18 × 40 = 720,
30/18 = 30 × 40/18 × 40 = 1200/720 - Likewise, for the 2nd fraction, since 80 × 9 = 720,
42/80 = 42 × 9/80 × 9 = 378/720 - Add the two like fractions:
1200/720 + 378/720 = 1200 + 378/720 = 1578/720 - 1578/720 simplified gives 263/120
- So, 30/18 + 42/80 = 263/120
In mixed form: 223/120
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18+42/80 30/18+84/80 30/36+42/80 90/18+42/80 30/54+42/80 30/90+42/80