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    2.3×0.3= 0.42×O.2= 3.5×0.2=
    12×0.2= 1.8×0.5= 0.9×0.11=
    1.22×0.4= 0.12×0.6= 0.02×500=
    分析：小数乘法的计算方法：按照整数乘法的法则算出积，再看因数中一共有几位小数，就从得数的右边起数出几位，点上小数点；据此计算得解．
    解答：
    解：
    2.3×0.3=0.69，
    0.42×O.2=0.084，
    3.5×0.2=0.7，
    12×0.2=2.4， 1.8×0.5=0.9， 0.9×0.11=0.099，
    1.22×0.4=0.488， 0.12×0.6=0.072， 0.02×500=10．
    点评：此题考查小数乘法的计算方法的灵活运用，要注意积的小数位数等于两个因数的小数位数之和，还要注意得数的小数部分末尾有0，一般要把0去掉进行化简．
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