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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:根據整數乘法的計算方法進行計算.
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
點評:口算時,注意運算符號和數據,然后再進一步計算.
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