口算:
0.9÷0.1=
9
9
32×0.4=
12.8
12.8
9.6÷8=
1.2
1.2
;
0.64÷8=
0.08
0.08
0÷45.2=
0
0
;
0.32÷16=
0.02
0.02
;
2.5×10=
25
25
56÷0.7=
80
80
;
65.8÷100=
0.658
0.658
0.36÷0.3=
1.2
1.2
;
2.4×0.5=
1.2
1.2
;
90.5÷1000=
0.09.5
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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