Subtract 15/5 from 1/42, Solve 1/42

Subtract 15/5 from 1/42

1^st number: 1/42, 2^nd number: 3 0/5

1/42 - 15/5 is -125/42.

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,
1/42 = 1 × 5/42 × 5 = 5/210
Likewise, for the 2nd fraction, since 5 × 42 = 210,
15/5 = 15 × 42/5 × 42 = 630/210
Subtract the two like fractions:
5/210 - 630/210 = 5 - 630/210 = -625/210
After reducing the fraction, the answer is -125/42

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