Solutions by everydaycalculation.com

754 - 721 is -1154.

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

LCM of 54 and 21 is**378**

Next, find the equivalent fraction of both fractional numbers with denominator 378 - For the 1st fraction, since 54 × 7 = 378,

754 = 7 × 754 × 7 = 49378 - Likewise, for the 2nd fraction, since 21 × 18 = 378,

721 = 7 × 1821 × 18 = 126378 - Subtract the two like fractions:

49378 - 126378 = 49 - 126378 = -77378 - After reducing the fraction, the answer is -1154

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