Add 30/70 and 42/18
1st number: 30/70, 2nd number: 2 6/18
30/70 + 42/18 is 58/21.
Steps for adding fractions
- Find the least common denominator or LCM of the two denominators:
LCM of 70 and 18 is 630
Next, find the equivalent fraction of both fractional numbers with denominator 630 - For the 1st fraction, since 70 × 9 = 630,
30/70 = 30 × 9/70 × 9 = 270/630 - Likewise, for the 2nd fraction, since 18 × 35 = 630,
42/18 = 42 × 35/18 × 35 = 1470/630 - Add the two like fractions:
270/630 + 1470/630 = 270 + 1470/630 = 1740/630 - 1740/630 simplified gives 58/21
- So, 30/70 + 42/18 = 58/21
In mixed form: 216/21
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70+42/18 30/70+84/18 30/70+42/36 90/70+42/18 30/70+42/54 30/70+42/90