WEBVTT

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Here is the problem: 4 over 6 minus 6 over 7.

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Exact arithmetic with fractions (results kept in lowest terms).

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Rewrite both fractions with the least common denominator. The LCD of 3 and 7 is 21.

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Subtract the numerators and keep the denominator.

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Final answer in lowest terms.

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So the answer is negative 4 over 21.

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Fractions are combined over a common denominator for addition and subtraction, multiplied straight across, and divided by multiplying by the reciprocal. The result is reduced by the greatest common factor.

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Decimal check: negative 4 over 21 approximately negative 0.1904761905.