Subtract 6/15 from 3/42, Solve 3/42

Subtract 6/15 from 3/42

3/42 - 6/15 is -23/70.

Find the least common denominator or LCM of the two denominators:
LCM of 42 and 15 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 15 × 14 = 210,
6/15 = 6 × 14/15 × 14 = 84/210
Subtract the two like fractions:
15/210 - 84/210 = 15 - 84/210 = -69/210
After reducing the fraction, the answer is -23/70

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