Subtract 36/20 from 10/42, Solve 10/42

Subtract 36/20 from 10/42

1^st number: 10/42, 2^nd number: 1 16/20

10/42 - 36/20 is -164/105.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 20 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 42 × 10 = 420,
10/42 = 10 × 10/42 × 10 = 100/420
Likewise, for the 2nd fraction, since 20 × 21 = 420,
36/20 = 36 × 21/20 × 21 = 756/420
Subtract the two like fractions:
100/420 - 756/420 = 100 - 756/420 = -656/420
After reducing the fraction, the answer is -164/105

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