Subtract 80/5 from 15/42, Solve 15/42

Subtract 80/5 from 15/42

1^st number: 15/42, 2^nd number: 16 0/5

15/42 - 80/5 is -219/14.

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,
15/42 = 15 × 5/42 × 5 = 75/210
Likewise, for the 2nd fraction, since 5 × 42 = 210,
80/5 = 80 × 42/5 × 42 = 3360/210
Subtract the two like fractions:
75/210 - 3360/210 = 75 - 3360/210 = -3285/210
After reducing the fraction, the answer is -219/14

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