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,苏教版,五年级上册,练习十二,5,1,9.80.3,41.42.5,9.8,0.3,4,9,2,.,2.94,4 1.4,2.5,0,7,0,2,8,2,8,0,5,3,0,1,.,103.5,教材,P67,练习十二 第,1,题,0.52.96,0.0367.5,2.9 6,0.5,0,8,4,1,.,1.48,6 7.5,0.0 3,5,2,0,2,.,2.025,2,下面的计算对吗?把不对的改正。,2.5,3.5,8 7 5,1 2 5,7 5,.,.,1 6.4,4.5,7 3 8 0,8 2 0,6 5 6,.,.,8 2.3,0.0 4,3 2 9 2,.,.,教材,P67,练习十二 第,2,题,不对。,先点小数点,再去掉,0,不对。,不对。,3,一种西服面料,每米售价,58.5,元。买,5.2,米这种面料,应付多少元?,(先估计得数,再计算),58.55.2,5 8.5,5.2,0,7,1,1,5,2,9,2,0,2,4,0,3,.,304.2,(元),答:应付,304.2,元。,教材,P67,练习十二 第,3,题,将,5.2,看作,5,,,58.55,292.5,(元),应付价格大于,292.5,元。,4,根据第一栏的积,写出其他各栏的积。,7.2,0.72,7.2,7.2,0.072,教材,P67,练习十二 第,4,题,5,0.670.13,0.090.84,0.6 7,0.1 3,1,0,2,7,6,1,7,8,0,0,.,0.0871,0.8 4,0.0 9,6,5,7,0,0,.,0.0756,教材,P67,练习十二 第,5,题,1.020.76,0.322.05,1.0 2,0.7 6,2,1,6,4,1,7,2,5,7,7,0,.,0.7752,2.0 5,0.3 2,0,1,4,5,1,6,0,6,5,6,0,.,0.656,0.04514,0.190.25,0.0 4 5,1 4,0,8,1,5,4,0,3,6,0,.,0.63,0.1 9,0.2 5,5,9,8,3,5,7,4,0,0,.,0.0475,6,一块长方形铝板,长,0.85,米,宽,0.6,米;一块正方形铝板,边长,0.72,米。哪一块铝板的面积大?大多少平方米?,0.850.6,0.51,(平方米),0.720.72,0.5184,(平方米),0.5184,0.51,0.0084,(平方米),答:正方形铝板的面积大;大,0.0084,平方米。,教材,P67,练习十二 第,6,题,7,一台拖拉机每小时耕地,0.5,公顷,,1.2,小时可耕地多少公顷?,0.75,小时可耕地多少公顷?,0.51.2,0.6,(公顷),0.50.75,0.375,(公顷),答:,1.2,小时可耕地,0.6,公顷,,0.75,小时可耕地,0.375,公顷。,教材,P67,练习十二 第,7,题,8,写出表中各数的近似数。,1,0.8,0.81,0.805,2,2.0,1.97,1.974,教材,P67,练习十二 第,8,题,9,计算下面各题,得数保留一位小数。,5.23.4,1.326.8,2.93.14,17.7,9.0,9.1,=17.68,=8.976,=9.106,教材,P67,练习十二 第,9,题,10,计算下面各题,得数保留两位小数。,0.732.02,8.40.69,5.90.76,1.47,5.80,4.48,教材,P68,练习十二 第,10,题,=1.4746,=5.796,=4.484,11,小新出生时身高,0.5,米,体重,3.4,千克。现在小新的身高是出生时的,2.8,倍,体重是出生时的,9.5,倍。他现在的身高和体重各是多少?,0.52.8,1.4,(米),3.49.5,32.3,(千克),答:,现在的身高是,1.4,米,体重是,32.3,千克。,教材,P68,练习十二 第,11,题,12,直接写出得数。,0.70.7,1.110,0.240.2,3.50.1,0.20.4,0.65,0.49,11,0.048,0.35,0.08,3,教材,P68,练习十二 第,12,题,13,计算下面各题,并用计算器验算。,0.861.7,3.50.67,0.8 6,1.7,2,0,6,6,8,2,6,4,1,.,1.462,0.6 7,3.5,5,3,3,1,0,2,5,4,3,2,.,2.345,教材,P68,练习十二 第,13,题,0,0,0.650.48,1.040.025,0.6 5,0.4 8,0,2,0,6,0,2,1,3,0,.,5,2,0.312,0.0 2 5,1.0 4,0,2,5,8,0,0,6,2,.,2,0,0.026,14,4.949,4.9,4.851,6.96,5.8,4.64,4.41,3.15,1.89,教材,P68,练习十二 第,14,题,15,不计算,直接在 里填“”或“”。,教材,P68,练习十二 第,15,题,16,一块平行四边形塑料板,底,3.2,分米,高,1.84,分米。它的面积大约是多少平方分米?,(先估算,再计算,得数保留一位小数),教材,P68,练习十二 第,16,题,3.21.84,5.888,(平方分米),5.9,(平方分米),答:它的面积大约是,5.9,平方分米。,把,1.84,看作,2,,,3.22,6.4,,面积比,6.4,平方分米小。,17,我国渤海的面积是,7.7,万平方千米,黄海、东海、南海的面积分别是渤海的,4.9,倍、,10.3,倍和,46.6,倍。黄海、东海和南海的面积大约各是多少万平方千米?,(得数保留一位小数),教材,P68,练习十二 第,17,题,7.74.9,37.7,(万平方千米),答:黄海的面积大约是,37.7,万平方千米。东海的面积是,79.3,万平方千米。南海的面积是,358.8,万平方千米。,7.710.3,79.3,(万平方千米),7.746.6,358.8,(万平方千米),18,购买下面的水果各要多少元?,(得数保留两位小数),教材,P68,练习十二 第,18,题,2.65.98,15.55,(元),答:需要,15.55,元。,1.56.25,9.38,(元),答:需要,9.38,元。,
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