Subtract 80/7 from 60/18, Solve 3 6/18

Subtract 80/7 from 60/18

1^st number: 3 6/18, 2^nd number: 11 3/7

60/18 - 80/7 is -170/21.

Find the least common denominator or LCM of the two denominators:
LCM of 18 and 7 is 126

Next, find the equivalent fraction of both fractional numbers with denominator 126
For the 1st fraction, since 18 × 7 = 126,
60/18 = 60 × 7/18 × 7 = 420/126
Likewise, for the 2nd fraction, since 7 × 18 = 126,
80/7 = 80 × 18/7 × 18 = 1440/126
Subtract the two like fractions:
420/126 - 1440/126 = 420 - 1440/126 = -1020/126
After reducing the fraction, the answer is -170/21

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