After adding two 0s at the end of an integer, it is 990 larger than the original number. What is the original integer?
一个整数的末尾添上两个0后，比原数大990，原来这个整数是多少．
<gadget id="calculator">100 - 1</gadget>
<output>99</output>

<gadget id="calculator">990 / 99</gadget>
<output>10</output>

<result>10</result>