little careless, too careless. I misunderstood the question of calculation and subtraction, and copied 8 into 3 in the unit digit of the subtrahend. The calculated difference is 305. Do you know what the correct number is?
小粗心，太大意．计算减法看错题，被减数个位的8抄成3．这样算出的差是305．你知道正确得数是几吗？
<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<gadget id="calculator">305 + 5</gadget>
<output>310</output>

<result>310</result>