When Honghong was calculating a decimal addition, she changed the position of 6 in the tens place and 9 in the hundreds place of one of the addends, and the result was much more than the correct answer.
红红在计算一道小数加法时，将其中一个加数十分位上的6和百位上9换错了位置，结果比正确答案多了多少．
<gadget id="calculator">0.9 - 0.6</gadget>
<output>0.3</output>

<gadget id="calculator">0.09 - 0.06</gadget>
<output>0.03</output>

<gadget id="calculator">0.3 - 0.03</gadget>
<output>0.27</output>

<result>0.27</result>