Subtract 27/10 from 3/42, Solve 3/42

Subtract 27/10 from 3/42

1^st number: 3/42, 2^nd number: 2 7/10

3/42 - 27/10 is -92/35.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 10 is 210

Next, find the equivalent fraction of both fractional numbers with denominator 210
For the 1st fraction, since 42 × 5 = 210,
3/42 = 3 × 5/42 × 5 = 15/210
Likewise, for the 2nd fraction, since 10 × 21 = 210,
27/10 = 27 × 21/10 × 21 = 567/210
Subtract the two like fractions:
15/210 - 567/210 = 15 - 567/210 = -552/210
After reducing the fraction, the answer is -92/35

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