Subtract 10/8 from 4/90, Solve 4/90

Subtract 10/8 from 4/90

1^st number: 4/90, 2^nd number: 1 2/8

4/90 - 10/8 is -217/180.

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,
4/90 = 4 × 4/90 × 4 = 16/360
Likewise, for the 2nd fraction, since 8 × 45 = 360,
10/8 = 10 × 45/8 × 45 = 450/360
Subtract the two like fractions:
16/360 - 450/360 = 16 - 450/360 = -434/360
After reducing the fraction, the answer is -217/180

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