When Xiao Ming does subtraction, he regards the hundreds digit 8 of the subtrahend as 6, and the tens digit 3 of the subtrahend as 5. The calculated difference is 390. What is the correct difference?
小明在做减法时，把被减数的百位数字8看成6，把减数的十位数字3看成5，这样计算得到的差是390，正确的差是多少？
<gadget id="calculator">200 + 20</gadget>
<output>220</output>

<gadget id="calculator">390 + 220</gadget>
<output>610</output>

<result>610</result>