Subtract 9/5 from 27/42, Solve 27/42

Subtract 9/5 from 27/42

1^st number: 27/42, 2^nd number: 1 4/5

27/42 - 9/5 is -81/70.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 5 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 42 × 5 = 210,
27/42 = 27 × 5/42 × 5 = 135/210
Likewise, for the 2nd fraction, since 5 × 42 = 210,
9/5 = 9 × 42/5 × 42 = 378/210
Subtract the two like fractions:
135/210 - 378/210 = 135 - 378/210 = -243/210
After reducing the fraction, the answer is -81/70

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