After the decimal point of 0.639 is moved three places to the right, and then one place to the left, the number will be increased by how many times the original decimal point
0.639的小数点向右移动三位后，再向左移动一位，这个数就比原小数增加多少倍
<gadget id="calculator">100 - 1</gadget>
<output>99</output>

<result>99</result>