Solutions by everydaycalculation.com

645 - 612 is -1130.

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

LCM of 45 and 12 is**180**

Next, find the equivalent fraction of both fractional numbers with denominator 180 - For the 1st fraction, since 45 × 4 = 180,

645 = 6 × 445 × 4 = 24180 - Likewise, for the 2nd fraction, since 12 × 15 = 180,

612 = 6 × 1512 × 15 = 90180 - Subtract the two like fractions:

24180 - 90180 = 24 - 90180 = -66180 - After reducing the fraction, the answer is -1130

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