Subtract 8/5 from 10/42, Solve 10/42

Subtract 8/5 from 10/42

1^st number: 10/42, 2^nd number: 1 3/5

10/42 - 8/5 is -143/105.

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,
10/42 = 10 × 5/42 × 5 = 50/210
Likewise, for the 2nd fraction, since 5 × 42 = 210,
8/5 = 8 × 42/5 × 42 = 336/210
Subtract the two like fractions:
50/210 - 336/210 = 50 - 336/210 = -286/210
After reducing the fraction, the answer is -143/105

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