Subtract 42/16 from 3/45, Solve 3/45

Subtract 42/16 from 3/45

1^st number: 3/45, 2^nd number: 2 10/16

3/45 - 42/16 is -307/120.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 16 is 720

Next, find the equivalent fraction of both fractional numbers with denominator 720
For the 1st fraction, since 45 × 16 = 720,
3/45 = 3 × 16/45 × 16 = 48/720
Likewise, for the 2nd fraction, since 16 × 45 = 720,
42/16 = 42 × 45/16 × 45 = 1890/720
Subtract the two like fractions:
48/720 - 1890/720 = 48 - 1890/720 = -1842/720
After reducing the fraction, the answer is -307/120

MathStep (Works offline)

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