Subtract 50/42 from 10/18, Solve 10/18

Subtract 50/42 from 10/18

1^st number: 10/18, 2^nd number: 1 8/42

10/18 - 50/42 is -40/63.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 42 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 18 × 7 = 126,
10/18 = 10 × 7/18 × 7 = 70/126
Likewise, for the 2nd fraction, since 42 × 3 = 126,
50/42 = 50 × 3/42 × 3 = 150/126
Subtract the two like fractions:
70/126 - 150/126 = 70 - 150/126 = -80/126
After reducing the fraction, the answer is -40/63

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