Subtract 12/70 from 72/18, Solve 4 0/18

Subtract 12/70 from 72/18

1^st number: 4 0/18, 2^nd number: 12/70

72/18 - 12/70 is 134/35.

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,
72/18 = 72 × 35/18 × 35 = 2520/630
Likewise, for the 2nd fraction, since 70 × 9 = 630,
12/70 = 12 × 9/70 × 9 = 108/630
Subtract the two like fractions:
2520/630 - 108/630 = 2520 - 108/630 = 2412/630
After reducing the fraction, the answer is 134/35
In mixed form: 329/35

MathStep (Works offline)

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