Subtract 80/7 from 30/36, Solve 30/36

Subtract 80/7 from 30/36

1^st number: 30/36, 2^nd number: 11 3/7

30/36 - 80/7 is -445/42.

Find the least common denominator or LCM of the two denominators:
LCM of 36 and 7 is 252

Next, find the equivalent fraction of both fractional numbers with denominator 252
For the 1st fraction, since 36 × 7 = 252,
30/36 = 30 × 7/36 × 7 = 210/252
Likewise, for the 2nd fraction, since 7 × 36 = 252,
80/7 = 80 × 36/7 × 36 = 2880/252
Subtract the two like fractions:
210/252 - 2880/252 = 210 - 2880/252 = -2670/252
After reducing the fraction, the answer is -445/42

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