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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,*,笔算乘法(例,7,),多位数乘一位数,四舍:,60,、,61,、,62,、,63,、,64,五入:,55,、,56,、,57,、,58,、,59,大约有,60,支,请说出下面各数接近哪个整十或整百数,29,41,30,40,288,300,112,100,收集信息,明确问题,三(,1,)班有,29,人参观,带,250,元买门票够吗?,三(,1,)班有,29,人参观,带,250,元买门票够吗?,29,30,308,240,(元),298,240,(元),240,250,估算,所以带,250,元够买门票。,三(,1,)班有,29,人参观,带,250,元买门票够吗?,298,232,(元),232,250,精算,所以带,250,元够买门票。,如果有,92,人参观,带,700,元买门票够吗?,92,90,908,720,(元),720,700,所以带,700,元不够。,800,元呢?,92,100,1008,800,(元),所以带,800,元够。,32,30,306,180,32,6,180,(千克),王伯伯家一共摘了,180,千克苹果。一个箱子最多能装,32,千克,,6,个箱子能装下这些苹果吗?,答:,6,个箱子装不下这些苹果。,一篇文章,500,字,丁叔叔平均每分钟录入,75,个字,,6,分钟能录完吗?,
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