When Xiao Ming calculated an addition problem, he mistakenly regarded 3.5 as 5.3, so how much difference does his calculation result have from the correct answer?
小明在计算一道加法式题时，错误地将3.5看成5.3，这样他算的结果与正确的答案相差多少．
<gadget id="calculator">5.3 - 3.5</gadget>
<output>1.8</output>

<result>1.8</result>