Solutions by everydaycalculation.com

1660 - 2170 is -130.

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

LCM of 60 and 70 is**420**

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

1660 = 16 × 760 × 7 = 112420 - Likewise, for the 2nd fraction, since 70 × 6 = 420,

2170 = 21 × 670 × 6 = 126420 - Subtract the two like fractions:

112420 - 126420 = 112 - 126420 = -14420 - After reducing the fraction, the answer is -130

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