Which number produces a rational number when multiplied by 0.25?

D is the correct answer.

0.25 is rational because it can be represented as a ratio of integers (1/4).

0.45 is rational because it can also be represented as a ratio of integers (9/20).

When you multiply rational numbers, you always end up with a rational number.

0.25*0.45=0.1125 or 1125/10000

0.45 * 0.25 = 0.1125

ur answer is : 0.45
** a rational number times a rational number = a rational number