Add 30/18 and 25/70
1st number: 1 12/18, 2nd number: 25/70
30/18 + 25/70 is 85/42.
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,
30/18 = 30 × 35/18 × 35 = 1050/630 - Likewise, for the 2nd fraction, since 70 × 9 = 630,
25/70 = 25 × 9/70 × 9 = 225/630 - Add the two like fractions:
1050/630 + 225/630 = 1050 + 225/630 = 1275/630 - 1275/630 simplified gives 85/42
- So, 30/18 + 25/70 = 85/42
In mixed form: 21/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 60/18+25/70 30/18+50/70 30/36+25/70 90/18+25/70 30/18+75/70 30/54+25/70 30/90+25/70