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练习十二,苏教版五年级上册,1,9.80.3,41.42.5,9.8,0.3,4,9,2,.,2.94,4 1.8,2.5,0,9,0,2,6,3,8,0,5,4,0,1,.,104.5,0.52.96,0.0367.5,2.9 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。,.,.,先点小数点；,再去掉,0,.,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。,4,根据第一栏的积，写出其他各栏的积。,7.2,0.72,7.2,7.2,0.072,5,0.670.13,0.090.84,0.6 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,.,0.0756,1.020.76,0.322.05,1.0 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。,7,一台拖拉机每小时耕地,0.5,公顷，,1.5,小时可耕地多少公顷？,0.75,小时可耕地多少公顷？,0.50.15,0.75,（公顷）,0.50.75,0.375,（公顷）,答：,1.5,小时可耕地,0.75,公顷，,0.75,小时可耕地,0.375,公顷。,8,写出表中各数的近似数。,1,0.8,0.81,0.805,2,2.0,1.97,1.974,9,计算下面各题，得数保留一位小数。,5.23.4,1.326.8,2.93.14,17.7,9.0,9.1,10,计算下面各题，得数保留两位小数。,0.732.02,8.40.69,5.90.76,1.47,5.80,4.48,11,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。,12,直接写出得数。,0.70.7,1.110,0.240.2,3.50.1,0.20.4,0.65,0.49,11,0.048,0.35,0.08,3,13,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,.,2.345,0,0,0.650.48,1.040.025,0.6 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,.,2,0,0.026,14,4.949,4.9,4.851,6.96,5.8,4.64,4.41,3.15,1.89,15,不计算，直接在 里填“”或“”。,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）,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。,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）,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）,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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