Add a 0 to the first digit after the decimal point of 3.69, how much is the resulting number less than the original number
在3.69的小数点后面第一位添上一个0，所得的数与原数相比，少多少
<gadget id="calculator">3.69 - 3.069</gadget>
<output>0.621</output>

<result>0.621</result>