Subtract 28/60 from 12/42, Solve 12/42

Subtract 28/60 from 12/42

12/42 - 28/60 is -19/105.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 60 is 420

Next, find the equivalent fraction of both fractional numbers with denominator 420
For the 1st fraction, since 42 × 10 = 420,
12/42 = 12 × 10/42 × 10 = 120/420
Likewise, for the 2nd fraction, since 60 × 7 = 420,
28/60 = 28 × 7/60 × 7 = 196/420
Subtract the two like fractions:
120/420 - 196/420 = 120 - 196/420 = -76/420
After reducing the fraction, the answer is -19/105

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