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

Subtract 3/15 from 6/42

6/42 - 3/15 is -2/35.

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,
6/42 = 6 × 5/42 × 5 = 30/210
Likewise, for the 2nd fraction, since 15 × 14 = 210,
3/15 = 3 × 14/15 × 14 = 42/210
Subtract the two like fractions:
30/210 - 42/210 = 30 - 42/210 = -12/210
After reducing the fraction, the answer is -2/35

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