Subtract 12/70 from 3/63, Solve 3/63

Subtract 12/70 from 3/63

3/63 - 12/70 is -13/105.

Find the least common denominator or LCM of the two denominators:
LCM of 63 and 70 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 63 × 10 = 630,
3/63 = 3 × 10/63 × 10 = 30/630
Likewise, for the 2nd fraction, since 70 × 9 = 630,
12/70 = 12 × 9/70 × 9 = 108/630
Subtract the two like fractions:
30/630 - 108/630 = 30 - 108/630 = -78/630
After reducing the fraction, the answer is -13/105

MathStep (Works offline)

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