Subtract 10/5 from 7/42, Solve 7/42

Subtract 10/5 from 7/42

1^st number: 7/42, 2^nd number: 2 0/5

7/42 - 10/5 is -11/6.

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,
7/42 = 7 × 5/42 × 5 = 35/210
Likewise, for the 2nd fraction, since 5 × 42 = 210,
10/5 = 10 × 42/5 × 42 = 420/210
Subtract the two like fractions:
35/210 - 420/210 = 35 - 420/210 = -385/210
After reducing the fraction, the answer is -11/6

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