口算:
0.9÷0.1=________;
32×0.4=________;9.6÷8=________;0.64÷8=________;
0÷45.2=________;0.32÷16=________;2.5×10=________;56÷0.7=________;
65.8÷100=________;0.36÷0.3=________;2.4×0.5=________;90.5÷1000=________.

9    12.8    1.2    0.08    0    0.02    25    80    0.658    1.2    1.2    0.09.5
分析:小數(shù)乘法按著整數(shù)乘法的法則進(jìn)行計(jì)算,再看因數(shù)中一共有幾位小數(shù),就從積的末位起數(shù)出幾位,點(diǎn)上小數(shù)點(diǎn);
小數(shù)除法,先移動(dòng)除數(shù)的小數(shù)點(diǎn)使它變成整數(shù),除數(shù)的小數(shù)點(diǎn)向右移動(dòng)幾位,被除數(shù)的小數(shù)點(diǎn)也向右移動(dòng)幾位,然后按著除數(shù)是整數(shù)的除法進(jìn)行計(jì)算;
利用法則直接解答.
解答:
解:0.9÷0.1=9;32×0.4=12.8;9.6÷8=1.2;0.64÷8=0.08;
0÷45.2=0;0.32÷16=0.02;2.5×10=25;56÷0.7=80;
65.8÷100=0.658;0.36÷0.3=1.2;2.4×0.5=1.2;90.5÷1000=0.0905

點(diǎn)評(píng):此題考查小數(shù)乘法、小數(shù)除法,按法則進(jìn)行計(jì)算.
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