Subtract 45/70 from 30/18, Solve 1 12/18

Subtract 45/70 from 30/18

1^st number: 1 12/18, 2^nd number: 45/70

30/18 - 45/70 is 43/42.

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,
45/70 = 45 × 9/70 × 9 = 405/630
Subtract the two like fractions:
1050/630 - 405/630 = 1050 - 405/630 = 645/630
After reducing the fraction, the answer is 43/42
In mixed form: 11/42

MathStep (Works offline)

Download our mobile app and learn to work with fractions in your own time:
Android and iPhone/ iPad