Subtract 75/42 from 20/32, Solve 20/32

Subtract 75/42 from 20/32

1^st number: 20/32, 2^nd number: 1 33/42

20/32 - 75/42 is -65/56.

Find the least common denominator or LCM of the two denominators:
LCM of 32 and 42 is 672

Next, find the equivalent fraction of both fractional numbers with denominator 672
For the 1st fraction, since 32 × 21 = 672,
20/32 = 20 × 21/32 × 21 = 420/672
Likewise, for the 2nd fraction, since 42 × 16 = 672,
75/42 = 75 × 16/42 × 16 = 1200/672
Subtract the two like fractions:
420/672 - 1200/672 = 420 - 1200/672 = -780/672
After reducing the fraction, the answer is -65/56

MathStep (Works offline)

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