When Xiaojun calculates a decimal subtraction, he regards the 5 in the tenth place of the minuend as 8, and the 6 in the minus percentile as 9. How far is the wrong answer from the correct answer.
小军计算一道小数减法时，把被减数十分位上的5看成8，把减数百分位上的6看成了9．错误的答案与正确的答案相差多少．
<gadget id="calculator">0.89 - 0.56</gadget>
<output>0.33</output>

<result>0.33</result>