口算下面各題.
0.7×0.9=
0.14×0.3=3.2×0.3=0.16×0.5=
7×0.08=1.8×0.04=60×0.5=0.24×3=
7.7×0.03=0.12×6=2.1×4=0.15×0.4=

解:

0.7×0.9=0.630.14×0.3=0.0423.2×0.3=0.960.16×0.5=0.08
7×0.08=0.561.8×0.04=0.07260×0.5=300.24×3=0.72
7.7×0.03=0.2310.12×6=0.722.1×4=8.40.15×0.4=0.06

分析:根據(jù)小數(shù)乘法的計(jì)算 方法進(jìn)行解答即可.
點(diǎn)評:在計(jì)算小數(shù)乘法時要注意:積的小數(shù)位數(shù)等于兩個因數(shù)小數(shù)位數(shù)的和.
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