Solutions by everydaycalculation.com

660 - 47 is -3370.

- Find the least common denominator or LCM of the two denominators:

LCM of 60 and 7 is**420**

Next, find the equivalent fraction of both fractional numbers with denominator 420 - For the 1st fraction, since 60 × 7 = 420,

660 = 6 × 760 × 7 = 42420 - Likewise, for the 2nd fraction, since 7 × 60 = 420,

47 = 4 × 607 × 60 = 240420 - Subtract the two like fractions:

42420 - 240420 = 42 - 240420 = -198420 - After reducing the fraction, the answer is -3370

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