Subtract 42/32 from 10/20, Solve 10/20

Subtract 42/32 from 10/20

1^st number: 10/20, 2^nd number: 1 10/32

10/20 - 42/32 is -13/16.

Find the least common denominator or LCM of the two denominators:
LCM of 20 and 32 is 160

Next, find the equivalent fraction of both fractional numbers with denominator 160
For the 1st fraction, since 20 × 8 = 160,
10/20 = 10 × 8/20 × 8 = 80/160
Likewise, for the 2nd fraction, since 32 × 5 = 160,
42/32 = 42 × 5/32 × 5 = 210/160
Subtract the two like fractions:
80/160 - 210/160 = 80 - 210/160 = -130/160
After reducing the fraction, the answer is -13/16

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