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口算.
34×3=
20×45= 60×90=
8×105= 50×70= 500×5=
18×5= 350×4= 300×9=
分析:根据整数乘法的计算方法进行计算.
解答:解:
34×3=102 20×45=900 60×90=5400
8×105=840 50×70=3500 500×5=2500
18×5=90 350×4=1400 300×9=2700
点评:口算时,注意运算符号和数据,然后再进一步计算.
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