Subtract 18/8 from 35/42, Solve 35/42

Subtract 18/8 from 35/42

1^st number: 35/42, 2^nd number: 2 2/8

35/42 - 18/8 is -17/12.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 8 is 168

Next, find the equivalent fraction of both fractional numbers with denominator 168
For the 1st fraction, since 42 × 4 = 168,
35/42 = 35 × 4/42 × 4 = 140/168
Likewise, for the 2nd fraction, since 8 × 21 = 168,
18/8 = 18 × 21/8 × 21 = 378/168
Subtract the two like fractions:
140/168 - 378/168 = 140 - 378/168 = -238/168
After reducing the fraction, the answer is -17/12

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