Subtract 18/10 from 4/42, Solve 4/42

Subtract 18/10 from 4/42

1^st number: 4/42, 2^nd number: 1 8/10

4/42 - 18/10 is -179/105.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 42 × 5 = 210,
4/42 = 4 × 5/42 × 5 = 20/210
Likewise, for the 2nd fraction, since 10 × 21 = 210,
18/10 = 18 × 21/10 × 21 = 378/210
Subtract the two like fractions:
20/210 - 378/210 = 20 - 378/210 = -358/210
After reducing the fraction, the answer is -179/105

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