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单击此处编辑母版标题样式,编辑母版文本样式,第二级,第三级,第四级,第五级,2019.11.13,#,单击此处编辑母版标题样式,编辑母版文本样式,第二级,第三级,第四级,第五级,2019.11.13,#,小数,加减法（,1,）,第六单元小数的加法和减法,小数加减法（1）第六单元小数的加法和减法,1,（练习）,1.,妈妈,把一根绳子截成两段，一段长,83cm,，另,一,段长,59+83,=142,（,cm,）,5,8,+,2,4,1,1,计算整数加法时要注意什么？,9,3,1,数位对齐,从个位加起,哪一位上的数相加满,十，就要,向前一位进,1,答：绳子,原来,长,142cm,。,59cm,。,绳子原来长多少厘米,？,（练习）1.妈妈把一根绳子截成两段，一段长83cm，另一段,2,计算整数减法时要注意什么？,数位对齐,从,个位减起,哪一位上的数不够减，要从前一位,退,1,答：,两段绳子,相差,24cm,。,83,-,59,=24,（,cm,）,-,4,2,13,7,8,3,5,9,（练习）,2.,妈妈,把一根绳子截成两段，一段长,83cm,，另一段长,59cm,。两段绳子相差多少厘米？,计算整数减法时要注意什么？数位对齐从个位减起哪一位上的数不够,3,（,1,）小丽买了下面两本书，一共花了多少钱？,6.45,+,4.29,=,10.74,（元）,4,2,+,4,7,0,1,5,9,1,.,6,4,.,.,1,小数点一定要对齐哦！,答：小丽一共,花,了,10.74,元。,课本,72,页 例,1,（1）小丽买了下面两本书，一共花了多少钱？6.45+4.,4,6.45,-,4.29,=,2.16,（元）,4,2,-,6,1,2,5,9,.,6,4,.,.,小数点一定要对齐哦！,答：,数学家的故事,比,童话选,贵,2,.16,元。,15,3,（,2,）,数学家的故事,比,童话选,贵多少钱？,课本,72,页 例,1,6.45-4.29=2.16（元）4 2 -612,5,课本,72,页 做一做,1.,计算下面各题，并且验算。,2.98,+,0.56,=,3.54,9,5,+,4,5,3,1,8,6,1,.,2,0,.,.,12.53,+,4.67,=,17.20,5,6,+,0,2,7,1,3,7,1,.,2,4,.,.,1,1,验算：,5,9,-,6,5,0,4,8,.,3,2,.,.,14,4,2,14,验算：,2,6,-,3,5,2,0,7,.,7,4,.,.,10,1,6,11,1,1,得数的小数部分末尾有,0,，可以化简。,或,17.2,课本72页 做一做1.计算下面各题，并且验算。2.98,6,6.07,+,4.89,=,10.96,0,8,+,6,9,0,1,7,9,1,.,6,4,.,.,1,验算：,9,0,-,9,8,4,6,7,.,0,6,.,.,16,8,0,10,1,5.64,-,1.78,=,3.86,6,7,-,6,8,3,4,8,.,5,1,.,.,14,5,4,15,验算：,7,8,+,4,6,5,1,8,6,1,.,1,3,.,.,6.07+4.89=10.960 8 +69017,7,7.2,-,0.8,=,6.4,2,8,-,4,6,.,7,0,.,.,12,6,验算：,4,8,+,2,7,1,.,6,0,.,.,15.62,-,7.46,=,8.16,6,4,-,6,1,8,2,6,.,5,7,.,.,12,5,0,15,1,验算：,4,1,+,2,6,5,1,6,6,1,.,7,8,.,.,1,7.2-0.8=6.42 8 -46.70.12,8,答：体重增加了,7.1kg,。,2.,下面,是小明的体重统计图。,2,9.8,-,22.7,=,7.1,（,kg,）,8,7,-,1,7,.,9,2,.,.,2,2,课本,72,页 做一做,（,1,）小明从,7,岁到,10,岁，体,重增加了多少千克？,答：体重增加了7.1kg。2.下面是小明的体重统计图。29,9,2,4.6,-,22.7,2,7.5,-,24.6,2,9.8,-,27.5,2.9,2.3,1.9,答：,9,岁那年比上一年增加,的最多,，增加了,2.9kg,。,=1.9,（,kg,）,=2.9,（,kg,）,=2.3,（,kg,）,2.,下面,是小明的体重统计图。,课本,72,页 做一做,（,2,）哪一年比上一年,增加,得,最多,？增加了多少？,24.6-22.727.5-24.629.8-2,10,4.42,7,6,+,2,4,4,1,6,6,1,.,3,0,.,.,验算：,4,7,-,6,6,0,2,6,.,4,3,.,.,12,3,3,13,2,0,+,3,3,4,5,8,1,.,1,3,.,.,4.33,验算：,3,2,-,8,0,3,3,5,.,4,1,.,.,13,2,（练习）列竖式计算并验算。,3.76+0.66=,1.25+3.08=,4.427 6 +2441661.30.验算：4 7,11,23.60,6,9,+,0,6,3,1,3,7,1,.,4,8,.,.,1,2,或,23.6,1,验算：,6,9,-,3,6,4,0,7,.,3,8,.,.,10,5,2,15,2,1,1,12,6.7,0,3,-,7,6,.,8,1,.,.,10,7,验算：,7,3,+,0,8,1,.,6,1,.,.,14.63+8.97=,8.0,-,1.3=,23.606 9 +0631371.48.12或 23,12,5.13,0,8,-,3,1,5,2,9,.,7,1,.,.,12,10,6,9,验算：,8,1,+,2,0,7,1,9,3,1,.,1,5,.,.,3.16,4,2,-,6,1,3,5,9,.,6,3,.,.,15,3,验算：,2,1,+,5,4,6,9,6,1,.,3,3,.,.,7.02,-,1.89=,6.45,-,3.29=,5.130 8 -31529.71.121069验算：,13,水费,电费,合计,3,月,36.20,74.90,4,月,47.60,85.20,总计,83.80,160.10,111.10,132.80,243.90,（练习）算一算，小帅家两个月的水费和电费一共是多少钱？,（单位：元）,水费电费合计3月36.2074.904月47.6085.20,14,
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