70×3= 16×3= 36×20= 18×40=
42×50= 24×20= 60×30= 98×100=
50-22= 80×90= 70×60= 75×80=
28×20= 14×70= 120+30= 18×30=
3×500= 42×20= 25×50= 50×60=
分析:根據(jù)整數(shù)乘法的計算方法進行解答即可.
解答:
解:70×3=210 16×3=48 36×20=720 18×40=720
42×50=2100 24×20=480 60×30=1800 98×100=9800
50-22=28 80×90=7200 70×60=4200 75×80=6000
28×20=560 14×70=980 120+30=150 18×30=540
3×500=1500 42×20=840 25×50=1250 50×60=3000
點評:本題考查了整數(shù)乘法的計算方法和口算能力.
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(122)3÷2.5 (123)84+(54-16) (124)
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(127)7.2÷(5-0.75+0.25) (128)725÷25+275÷25 (129)
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650
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400-
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300
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