If $10.0003 \times \square=10000.3$, the number that should replace the $\square$ is
(A) 100
(B) 1000
(C) 10000
(D) 0.001
(E) 0.0001
The answer, 10000.3, is 1000 times bigger than 10.0003 . This can be determined either by dividing 10000.3 by 10.0003 or by recognizing that the decimal point in 10.0003 is moved three places to the right to obtain 10000.3. Thus, the number that should replace the $\square$ is 1000 .

ANSWER: (B)