Q: What is dividing by 0.5 the same as in multiplying?

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Because multiplying or dividing them by the same NON-ZERO number does not alter their ratio.

because there the same

it is the same as multiplying by 0.4

Because doing so is equivalent to multiplying or dividing by x/x, which can be cancelled down to 1.

The answer is positive.

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Because multiplying or dividing them by the same NON-ZERO number does not alter their ratio.

because there the same

it is the same as multiplying by 0.4

Because doing so is equivalent to multiplying or dividing by x/x, which can be cancelled down to 1.

No, taking ½ of a number is the same as dividing it by 2. Dividing a number by ½ is the same as multiplying it by 2.

Dividing by a non-zero rational number is the same as multiplying by its reciprocal.

because of mathematical equivalence: it doesn't change the result

Multiplying by -1/3

The answer is positive.

That is the definition of reciprocal.

Yes, it is!:)