Subtract 42/30 from 75/42, Solve 1 33/42

Subtract 42/30 from 75/42

1^st number: 1 33/42, 2^nd number: 1 12/30

75/42 - 42/30 is 27/70.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 30 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 42 × 5 = 210,
75/42 = 75 × 5/42 × 5 = 375/210
Likewise, for the 2nd fraction, since 30 × 7 = 210,
42/30 = 42 × 7/30 × 7 = 294/210
Subtract the two like fractions:
375/210 - 294/210 = 375 - 294/210 = 81/210
After reducing the fraction, the answer is 27/70

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