0.4×0.5= 0.65×0.2= 2.4×0.5=
0.6×0.8= 0.05×1.6= 1.25×0.8=
0.7×0.6= 2.5×0.4= 125×0.8=
2.1×3= 0.2×5= 1.2×0.9=
分析:根據(jù)小數(shù)乘法的計(jì)算法則,直接進(jìn)行口算即可.
解答:解:
0.4×0.5=0.2 0.65×0.2=0.13 2.4×0.5=1.2
0.6×0.8=0.48 0.05×1.6=0.08 1.25×0.8=1
0.7×0.6=0.42 2.5×0.4=1 125×0.8=100
2.1×3=6.3 0.2×5=1 1.2×0.9=1.08.
點(diǎn)評(píng):此題考查的目的是理解掌握小數(shù)乘法的計(jì)算法則,并且能夠正確熟練地進(jìn)行口算,提高口算能力.
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