Add 15/70 and 30/18
1st number: 15/70, 2nd number: 1 12/18
15/70 + 30/18 is 79/42.
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,
15/70 = 15 × 9/70 × 9 = 135/630 - Likewise, for the 2nd fraction, since 18 × 35 = 630,
30/18 = 30 × 35/18 × 35 = 1050/630 - Add the two like fractions:
135/630 + 1050/630 = 135 + 1050/630 = 1185/630 - 1185/630 simplified gives 79/42
- So, 15/70 + 30/18 = 79/42
In mixed form: 137/42
MathStep (Works offline)
Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad
Related: 30/70+30/18 15/70+60/18 15/70+30/36 45/70+30/18 15/70+90/18 15/70+30/54 75/70+30/18 15/70+30/90