Move the decimal point of a decimal to the left by 2 digits, and then move it to the right by 3 digits. The result is 40.89. What is the original number of this decimal?
把一个小数的小数点先向左移动2位，再向右移动3位，结果是40.89，这个小数原是多少．
<gadget id="calculator">1_000 / 100</gadget>
<output>10</output>

<gadget id="calculator">40.89 / 10</gadget>
<output>4.089</output>

<result>4.089</result>