Reduce a number to its (1/1000), and then move the decimal point to the right two places, the result is 80.9. What is the original number.
把一个数缩小到它的(1/1000)，再把小数点向右移动两位，结果是80.9．原来这个数是多少．
<gadget id="calculator">80.9 / 100</gadget>
<output>0.809</output>

<gadget id="calculator">1_000 / 1</gadget>
<output>1_000</output>

<gadget id="calculator">0.809 * 1_000</gadget>
<output>809</output>

<result>809</result>