Every rational number does.
Any rational number will do.
Any irrational number added substracted multiplied or divided into a rational number produces an irrational answer.
It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.
The answer will depend on what it is to be multiplied by. Since this part is missing from the question, it is not possible to give a sensible answer.
Yes.
Every rational number does.
Any rational number will produce a rational number when multiplied by 0.5. This is because the product of two rational numbers is always rational. For example, if you multiply 0.5 by the rational number 2, the result is 1, which is also rational. Thus, any rational number you choose will satisfy this condition.
0.45
1/5
Any rational number multiplied by 0.5 will produce a rational number. This is because the product of two rational numbers is always rational. For example, if you take the rational number 2, multiplying it by 0.5 gives you 1, which is also rational. Thus, any rational number will suffice.
Any rational number will do.
Any irrational number multiplied by 0.5 will remain irrational. Any rational number multiplied by 0.5 will remain rational.
It must be a generalised rational number. Otherwise, if you select a rational number to multiply, then you will only prove it for that number.
Any number will be a rational number when multiplied.0 multiplied by any real number is rational and so it will produce a rational number when multiplied.If x is any non-zero number (rational or not), then since it is non-zero, 1/x is defined and x*(1/x) = 1 which is rational. So any non-zero number will produce a rational number when multiplied.Thus any number will produce a rational number when multiplied.
The product of two rational numbers is a rational number. All decimal numbers that terminate or end with a repeating sequence of digits are rational numbers. As both 0.54732814 (as written) and 0.5 are terminating decimals, they are both rational numbers. As 0.54732814 is a rational number and 0.5 is a rational number, their product will also be a rational number.
-- Every whole number is a rational number. -- Any whole number divided by any whole number (except zero) produces a rational number.
Yes. Since 0.555 and 0.5 are both rational numbers, their product will be rational.