Subtract 42/16 from 7/90, Solve 7/90

Subtract 42/16 from 7/90

1^st number: 7/90, 2^nd number: 2 10/16

7/90 - 42/16 is -917/360.

Find the least common denominator or LCM of the two denominators:
LCM of 90 and 16 is 720

Next, find the equivalent fraction of both fractional numbers with denominator 720
For the 1st fraction, since 90 × 8 = 720,
7/90 = 7 × 8/90 × 8 = 56/720
Likewise, for the 2nd fraction, since 16 × 45 = 720,
42/16 = 42 × 45/16 × 45 = 1890/720
Subtract the two like fractions:
56/720 - 1890/720 = 56 - 1890/720 = -1834/720
After reducing the fraction, the answer is -917/360

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