直接寫(xiě)出得數(shù):
35×20=________;
2.5×0.4=________;0.8×0.5=________;208÷100=________;
1.5×0.04=________;0.04×0.2=________;36÷1000=________;0×0.37=________;
1.7+0.43+3.3=________;0.5×0.12×0.2=________;1.2÷100×4=________;0.25×0.7×0.4=________.

700    1    0.4    2.08    0.06    0.008    0.036    0    5.43    0.012    0.048    0.07
分析:根據(jù)小數(shù)加減乘除法的計(jì)算方法進(jìn)行口算,能簡(jiǎn)算的要簡(jiǎn)算.
解答:35×20=700; 2.5×0.4=1; 0.8×0.5=0.4; 208÷100=2.08;
1.5×0.04=0.06; 0.04×0.2=0.008; 36÷1000=0.036; 0×0.37=0;
1.7+0.43+3.3=5.43; 0.5×0.12×0.2=0.012; 1.2÷100×4=0.048; 0.25×0.7×0.4=0.07.
故答案為:700,1,0.4,2.08,0.06,0.008,0.036,0,5.43,0.012,0.048,0.07.
點(diǎn)評(píng):口算,要靈活運(yùn)用所學(xué)知識(shí),快速準(zhǔn)確的進(jìn)行計(jì)算,特別要注意小數(shù)點(diǎn)的位置.
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