Add 15/18 and 42/70
15/18 + 42/70 is 43/30.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 18 and 70 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 18 × 35 = 630,
15/18 = 15 × 35/18 × 35 = 525/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
42/70 = 42 × 9/70 × 9 = 378/630 - Add the two like fractions:
525/630 + 378/630 = 525 + 378/630 = 903/630 - 903/630 simplified gives 43/30
- So, 15/18 + 42/70 = 43/30
In mixed form: 113/30
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/18+42/70 15/18+84/70 15/36+42/70 45/18+42/70 15/54+42/70 75/18+42/70 15/90+42/70