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,2019.01.05,#,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,2019.01.05,#,第六单元小数的加法和减法,练习十七,第六单元小数的加法和减法练习十七,1,课本,74,页 练习十七,1.,口算。,2.5,+,0.9,1.2,-,0.5,7.8,+,1.6,4.7,-,2.8,=3.4,=0.7,=9.4,=1.9,11.7,+,2,8.6,-,5.3,0.39,+,0.15,0.96,-,0.33,=13.7,=,3,.3,=0.54,=0.63,课本74页 练习十七1.口算。2.5+0.91.2,2,课本,74,页 练习十七,2.,计算下面各题并验算。,3.64,+,0.48,=,4.12,6,4,+,2,1,4,1,4,8,1,.,3,0,.,.,验算：,1,4,-,4,6,3,2,8,.,4,0,.,.,12,0,3,10,21.56,+,6.74,=,28.30,5,7,+,0,3,8,1,6,4,1,.,1,6,.,.,2,2,验算：,3,7,-,6,5,1,0,4,.,8,6,.,.,10,2,7,12,2,2,或,28.3,课本74页 练习十七2.计算下面各题并验算。3.64+,3,7.85,+,9.19,=,17.04,8,1,+,4,0,7,1,5,9,1,.,7,9,.,.,1,1,验算：,0,1,-,5,8,7,4,9,.,7,9,.,.,14,10,6,9,1,0,16,41.2,-,15.6,=,25.6,2,6,-,6,5,.,1,5,.,.,12,0,3,10,4,1,2,验算：,6,6,+,2,1,.,5,5,.,.,2,1,4,1,1,7.85+9.19=17.048 1 +40715,4,8.24,-,3.56,=,4.68,2,5,-,8,6,4,4,6,.,8,3,.,.,14,1,7,11,验算：,5,6,+,4,2,8,1,6,8,1,.,3,4,.,.,11.65,-,7.39,=,4.26,6,3,-,6,2,4,5,9,.,1,7,.,.,15,5,0,11,1,3,2,+,5,6,1,1,9,6,1,.,7,4,.,.,1,验算：,8.24-3.56=4.682 5 -86446.,5,3.,杯里的水有多少千克？,0.95,-,0.35,=0.6,（,kg,）,答：杯里的水有,0.6kg,。,0.35kg,0.95kg,课本,74,页 练习十七,3.杯里的水有多少千克？0.95-0.35=0.6（,6,4.,小丽家两个月的电话费和上网费如下表，把表填空整。,合计,4,月,83.54,元,80.00,元,5,月,79.26,元,80.00,元,总计,162.80,元,160.00,元,163.54,元,159.26,元,322.80,元,课本,74,页 练习十七,4.小丽家两个月的电话费和上网费如下表，把表填空整。合计,7,5.,课本,74,页 练习十七,10.32,16.08,20.24,3.08,44.3,0.45,+,=,-,=,1.37,9.8,14.5,8.95,6.28,5.74,6.52,62,0.7,3.44,17.7,0.25,5.课本74页 练习十七10.3216.0820.243,8,5,7,+,9,2,6,1,9,.,2,3,.,.,1,1,4,4,-,0,0,.,3,3,.,.,2,1,1,0,2,-,4,7,3,0,6,.,5,1,.,.,10,10,4,9,1,-,6,1,4,6,.,7,3,.,6.,下面的计算正确吗？把错误的改正过来。,课本,75,页 练习十七,5 7 +92619.23.114 4 -00.3,9,7.,用小数计算下面各题。,1t 30kg,+,980kg,5,元,6,角,2,分,+3,元零,9,分,低,高,10,0.6,元,低,高,100,0.02,元,低,高,100,0.09,元,5.62+3.09=,8.71,（,元）,低,高,1000,0.030,t,低,高,1000,0.980,t,1.03+0.98=,2.01,（,t,）,课本,75,页 练习十七,7.用小数计算下面各题。1t 30kg+980kg5元,10,4m 35cm,+,5m 70cm,低,高,100,0.35,m,低,高,100,0.70,m,4.35+5.7=,10.05,（,m,）,10kg,-,4kg 800g,低,高,1000,0.800,kg,10,-,4.8=,5.2,（,kg,）,4m 35cm+5m 70cm低高1000.35m低高,11,4km 800m,-,3km 50m,低,高,1000,0.800,km,低,高,1000,0.050,km,4.8,-,3.05=,1.75,（,k,m,）,6km,-,2km 860m,低,高,1000,0.860,km,6,-,2.86=,3.14,（,km,）,4km 800m-3km 50m低高10000.800,12,8.,可以怎样买？需要付多少钱？,75.80+45.50,=121.30,（元）,答：买,1,个黑白色的足球和,1,个蓝色的排球，需要付,121.30,元。,答案不唯一，合理即可。,课本,75,页 练习十七,我们班要买一个足球和一个排球。,可以买,1,个黑白色的足球和,1,个蓝色的排球。,8.可以怎样买？需要付多少钱？75.80+45.50=,13,9.,一些女子田径项目的中国纪录和世界纪录（截至,2010,年,2,月）如下表，它们各相差多少？,跳高,跳远,铅球,铁饼,标枪,100m,跑,中国纪录,1.97m,7.01m,21.76m,71.68m,63.92m,10.79,秒,世界纪录,2.09m,7.52m,22.63m,76.80m,72.28m,10.49,秒,跳高：,2.09,-,1.97,=0.12,（,m,）,跳远：,7.52,-,7.01,=0.51,（,m,）,铅球：,22.63,-,21.76,=0.87,（,m,）,铁饼：,76.80,-,71.68,=5.12,（,m,）,标枪：,72.28,-,63.92,=8.36,（,m,）,100m,跑：,10.79,-,10.49,=0.3,（秒）,课本,75,页 练习十七,9.一些女子田径项目的中国纪录和世界纪录（截至2010年2,14,10.,找规律填数。,（,1,）,0.2,，,0.4,，,0.6,，,0.8,，,_,，,_,。,（,2,）,1.11,，,1.16,，,1.21,，,1.26,，,_,，,_,。,（,3,）,4.363,，,4.366,，,4.369,，,4.372,，,_,，,_,。,（,4,）,7.897,，,7.892,，,7.887,，,7.882,，,_,，,_,。,1.0,1.2,1.31,1.36,4.375,4.378,7.877,7.872,公差：,0.4,-,0.2=0.2,公差：,1.16,-,1.11=0.05,公差：,4.366,-,4.363=0.003,公差：,7.897,-,7.892=0.005,课本,75,页 练习十七,10.找规律填数。（1）0.2，0.4，0.6，0.8，_,15,