Subtract 80/42 from 9/45, Solve 9/45

Subtract 80/42 from 9/45

1^st number: 9/45, 2^nd number: 1 38/42

9/45 - 80/42 is -179/105.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 42 is 630

Next, find the equivalent fraction of both fractional numbers with denominator 630
For the 1st fraction, since 45 × 14 = 630,
9/45 = 9 × 14/45 × 14 = 126/630
Likewise, for the 2nd fraction, since 42 × 15 = 630,
80/42 = 80 × 15/42 × 15 = 1200/630
Subtract the two like fractions:
126/630 - 1200/630 = 126 - 1200/630 = -1074/630
After reducing the fraction, the answer is -179/105

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