Subtract 42/16 from 45/75, Solve 45/75

Subtract 42/16 from 45/75

1^st number: 45/75, 2^nd number: 2 10/16

45/75 - 42/16 is -81/40.

Find the least common denominator or LCM of the two denominators:
LCM of 75 and 16 is 1200

Next, find the equivalent fraction of both fractional numbers with denominator 1200
For the 1st fraction, since 75 × 16 = 1200,
45/75 = 45 × 16/75 × 16 = 720/1200
Likewise, for the 2nd fraction, since 16 × 75 = 1200,
42/16 = 42 × 75/16 × 75 = 3150/1200
Subtract the two like fractions:
720/1200 - 3150/1200 = 720 - 3150/1200 = -2430/1200
After reducing the fraction, the answer is -81/40

MathStep (Works offline)

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