| 直接写出得数. 12.25-0.5= | 2÷1%= | 32×5= | 8×12.5%= | 0.23+177%= |
0.6÷ = | - = | × = | 529+198= | 305-199= |
| 2.05×4= | + ×0= | ÷ ÷ = | 0.68+ +0.32= |
| 解:12.25-0.5=11.75, | 2÷1%=200, | 32×5=160, | 8×12.5%=1, | 0.23+177%=2, |
0.6÷ =0.8, | - = , | × = , | 529+198=727, | 305-199=106, |
| 2.05×4=8.2, | + ×0= , | ÷ ÷ = , | 0.68+ +0.32=1 . |
分析:根据小数、百分数、整数和分数的加减乘除的计算方法进行计算即可.529+198=529+200-2;305-199=305-200+1;0.68+
+0.32=(0.68+0.32)+
.点评:口算时,看清数据和运算符号再进行计算,能简算的要简算.
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