Add 45/18 and 42/70
1st number: 2 9/18, 2nd number: 42/70
45/18 + 42/70 is 31/10.
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,
45/18 = 45 × 35/18 × 35 = 1575/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
42/70 = 42 × 9/70 × 9 = 378/630 - Add the two like fractions:
1575/630 + 378/630 = 1575 + 378/630 = 1953/630 - 1953/630 simplified gives 31/10
- So, 45/18 + 42/70 = 31/10
In mixed form: 31/10
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 90/18+42/70 45/18+84/70 45/36+42/70 45/54+42/70 45/90+42/70