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0.3×0.3=0.9.________.

错误
分析:我们根据“小数的乘法积的小数位数是两个因数的小数位数的和”.
解答:0.3×0.3=0.09;
所以题干中的做法是错误的.
故答案为:错误.
点评:本题是一道小数的乘法,考查了学生小数乘法中积的位数问题,考查了学生认真学习的态度.
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