Subtract 42/49 from 4/18, Solve 4/18

Subtract 42/49 from 4/18

4/18 - 42/49 is -40/63.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 49 is 882

Next, find the equivalent fraction of both fractional numbers with denominator 882
For the 1st fraction, since 18 × 49 = 882,
4/18 = 4 × 49/18 × 49 = 196/882
Likewise, for the 2nd fraction, since 49 × 18 = 882,
42/49 = 42 × 18/49 × 18 = 756/882
Subtract the two like fractions:
196/882 - 756/882 = 196 - 756/882 = -560/882
After reducing the fraction, the answer is -40/63

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