Subtract 80/42 from 9/25, Solve 9/25

Subtract 80/42 from 9/25

1^st number: 9/25, 2^nd number: 1 38/42

9/25 - 80/42 is -811/525.

Find the least common denominator or LCM of the two denominators:
LCM of 25 and 42 is 1050

Next, find the equivalent fraction of both fractional numbers with denominator 1050
For the 1st fraction, since 25 × 42 = 1050,
9/25 = 9 × 42/25 × 42 = 378/1050
Likewise, for the 2nd fraction, since 42 × 25 = 1050,
80/42 = 80 × 25/42 × 25 = 2000/1050
Subtract the two like fractions:
378/1050 - 2000/1050 = 378 - 2000/1050 = -1622/1050
After reducing the fraction, the answer is -811/525

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