Xiaofeng was too careless when doing the question. He copied the subtrahend digit into 2 and subtracted the tens digit from 3 to 8. This is 415. Do you know how few positive numbers are?
小峰做题时太粗心了，把被减数个位上的抄成2减数十位上3抄成8这的是415你知道正数是少？
<gadget id="calculator">5 - 2</gadget>
<output>3</output>

<gadget id="calculator">80 - 30</gadget>
<output>50</output>

<gadget id="calculator">415 + 3 + 50</gadget>
<output>468</output>

<result>468</result>