Subtract 35/20 from 1/42, Solve 1/42

Subtract 35/20 from 1/42

1^st number: 1/42, 2^nd number: 1 15/20

1/42 - 35/20 is -145/84.

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,
1/42 = 1 × 10/42 × 10 = 10/420
Likewise, for the 2nd fraction, since 20 × 21 = 420,
35/20 = 35 × 21/20 × 21 = 735/420
Subtract the two like fractions:
10/420 - 735/420 = 10 - 735/420 = -725/420
After reducing the fraction, the answer is -145/84

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