When Xiao Liang calculated the subtraction of decimals, he regarded the subtrahend 3.8 as 38, and the result was 52.8. What should be the correct number?
小亮在计算小数减法时，把减数3.8看成了38，结果是52.8，正确得数应是多少．
<gadget id="calculator">38 - 3.8</gadget>
<output>34.2</output>

<gadget id="calculator">52.8 + 34.2</gadget>
<output>87</output>

<result>87</result>