Subtract 75/27 from 60/42, Solve 1 18/42

Subtract 75/27 from 60/42

1^st number: 1 18/42, 2^nd number: 2 21/27

60/42 - 75/27 is -85/63.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 27 is 378

Next, find the equivalent fraction of both fractional numbers with denominator 378
For the 1st fraction, since 42 × 9 = 378,
60/42 = 60 × 9/42 × 9 = 540/378
Likewise, for the 2nd fraction, since 27 × 14 = 378,
75/27 = 75 × 14/27 × 14 = 1050/378
Subtract the two like fractions:
540/378 - 1050/378 = 540 - 1050/378 = -510/378
After reducing the fraction, the answer is -85/63

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