Add 30/70 and 70/18
1st number: 30/70, 2nd number: 3 16/18
30/70 + 70/18 is 272/63.
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,
70/18 = 70 × 35/18 × 35 = 2450/630 - Add the two like fractions:
270/630 + 2450/630 = 270 + 2450/630 = 2720/630 - 2720/630 simplified gives 272/63
- So, 30/70 + 70/18 = 272/63
In mixed form: 420/63
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/70+70/18 30/70+70/36 90/70+70/18 30/70+70/54 30/70+70/90