Subtract 42/25 from 3/45, Solve 3/45

Subtract 42/25 from 3/45

1^st number: 3/45, 2^nd number: 1 17/25

3/45 - 42/25 is -121/75.

Find the least common denominator or LCM of the two denominators:
LCM of 45 and 25 is 225

Next, find the equivalent fraction of both fractional numbers with denominator 225
For the 1st fraction, since 45 × 5 = 225,
3/45 = 3 × 5/45 × 5 = 15/225
Likewise, for the 2nd fraction, since 25 × 9 = 225,
42/25 = 42 × 9/25 × 9 = 378/225
Subtract the two like fractions:
15/225 - 378/225 = 15 - 378/225 = -363/225
After reducing the fraction, the answer is -121/75

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