Subtract 50/42 from 98/90, Solve 1 8/90

Subtract 50/42 from 98/90

1^st number: 1 8/90, 2^nd number: 1 8/42

98/90 - 50/42 is -32/315.

Find the least common denominator or LCM of the two denominators:
LCM of 90 and 42 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 90 × 7 = 630,
98/90 = 98 × 7/90 × 7 = 686/630
Likewise, for the 2nd fraction, since 42 × 15 = 630,
50/42 = 50 × 15/42 × 15 = 750/630
Subtract the two like fractions:
686/630 - 750/630 = 686 - 750/630 = -64/630
After reducing the fraction, the answer is -32/315

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