Subtract 42/8 from 10/90, Solve 10/90

Subtract 42/8 from 10/90

1^st number: 10/90, 2^nd number: 5 2/8

10/90 - 42/8 is -185/36.

Find the least common denominator or LCM of the two denominators:
LCM of 90 and 8 is 360

Next, find the equivalent fraction of both fractional numbers with denominator 360
For the 1st fraction, since 90 × 4 = 360,
10/90 = 10 × 4/90 × 4 = 40/360
Likewise, for the 2nd fraction, since 8 × 45 = 360,
42/8 = 42 × 45/8 × 45 = 1890/360
Subtract the two like fractions:
40/360 - 1890/360 = 40 - 1890/360 = -1850/360
After reducing the fraction, the answer is -185/36

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