一、口算:12,25,1,30,5,16,1,100,4二、填空:5,960004000缩小15倍738780,4,3两亿零四万七千零九,200050000,200000000100000000,121,22,2312三、下面的'话正确的画,错的画对,错,错,对,对,错,错,错四、选择题①. A②.C③.B④.D⑤.A五、用简便方法计算320643626430046553083532