新课标四年级简便运算乘法分配律的应用练习 (3)

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,*,数学第八册,乘法分配律的应用,一、复习,1,、判断。,（,1,）,2,（,6,5,）,=26,5,（）,（,2,）（,25,7,）,4=25474,（）,（,3,）,359,35=,35,（,9,1,）（）,2,、连一连。,317,517,（,18,4,）,6,22,30,4430,60,（,20,30,）,（,22,44,）,30,186,46,6020,6030,（,35,）,17,3,、填一填。,（,1,）（,12,40,）,3=,3,3,（,2,）,15,（,40,8,）,=15,15,（,3,）,7820,2220=,（,）,20,12,40,40,8,78,22,二、新课,例,1,、,94367,94333,=943,（,67,33,）,应用乘法分配律,=943100,=94300,例,2,、,35103,353,=35,（,103,3,）,=35100,应用乘法分配律的推广,=3500,103,个,35,减去,3,个,35,是多少个,35,？,67,个,943,加上,33,个,943,是,100,个,943,例,3,、,10243,=(100,2)43,=10043,243,乘法分配律,=4300,86,=4386,表示,100,个,43,加上,2,个,43,就是,102,个,43,例,4,、,2588,=25,（,80,8,）,88,分成（,80,8,）,=2580,258,=2000,200,=2200,方法二：,2588,=25422,把,88,分成,422,乘法分配律,=10022,=2200,例,5,、简算。,99135,=,（,100,1,）,135,把,99,看成（,100,1,）,=100135,1135,乘法分配律,=13500,135,=13365,65,99+65,想一想该怎么算？,=65,（,99,1,）,99,个,65,加上,1,个,65,是,100,个,65,=65100,=6500,1,三、巩固练习,简算：,（,1,）,3623,3677,（,2,）（,46,125,）,8,（,3,）,125,（,32,8,）,（,4,）,59102,=36,（,23,77,）,=36100,乘法分配律,=3600,=468,1258,=368,1000,=1368,乘法分配律,=12532,1258,乘法分配律,=4000,1000,=3000,=59,（,100,2,）,把,102,拆分（,100,2,）,=59100,592,=5900,118,=6018,乘法分配律,（,5,）,99252,（,6,）,9926,26,（,7,）,361258,（,8,）,38125,30125,=,（,100,1,）,252,=100252,1252,=25200,252,=52248,99,个,26,加上,1,个,26,是,100,个,26.,=,（,99,1,）,26,=10026,=2600,=36,（,125,8,）,=361000,=36000,=,（,38,30,）,125,38,个,125,减去,30,个,125,是多少个,125?,怎样算,?,=8125,=1000,1,5,16+5 24,36,24+19 24+,45,24,129,27+129 27+,129,找出相同的乘数：,34,12+34 56+,34,32,130,38+130 61+130,（,25+30,）,4,口述计算步骤：,作业:,用简便方法计算下面各题。,（,1,）,3537,3765,（,2,）,72101,72,（,3,）,264332,26432,（,4,）,99196,196,（,5,）,8,（,125,25,）（,6,）,25104,（,7,）,36,（,100,2,）（,8,）,1253225,