10
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.
1000
That is the definition of reciprocal.
If you have 1000 100s of something, that is the same as multiplying 1000 by 100, which is 100,000.
10
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.
1000
because of mathematical equivalence: it doesn't change the result
Multiplying by -1/3
1/2
The answer is positive.