Subtract 45/18 from 4/70, Solve 4/70

Subtract 45/18 from 4/70

1^st number: 4/70, 2^nd number: 2 9/18

4/70 - 45/18 is -171/70.

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,
4/70 = 4 × 9/70 × 9 = 36/630
Likewise, for the 2nd fraction, since 18 × 35 = 630,
45/18 = 45 × 35/18 × 35 = 1575/630
Subtract the two like fractions:
36/630 - 1575/630 = 36 - 1575/630 = -1539/630
After reducing the fraction, the answer is -171/70

MathStep (Works offline)

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