口算．13×5= 7×800= 72×3= 810÷9= 28÷2= 108×4=91×4= 300÷5= 840÷4= 186÷6= 0×53= 35+47=
直接写得数 4.3+3.57= 6.3÷0.9= 2.4×0.5= 1÷0.2÷0.5= 5﹣﹣= 10÷10%= 1÷0.2÷0.5= 7×÷7×=
直接写得数 24÷=﹣= 10+2.52=（﹣0.5）×=×=（+）×12=×÷×= 0.32×200=
计算下面各题．====+=====
口算：========
看图填空．
（1）红色+绿色=+= （2）黄色+黑色=+= （3）红色﹣黄色=﹣= （4）你还能提出什么数学问题？能解答吗？
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