【北师大版】四年级下册数学一课一练-3.5蚕丝（含答案）

四年级下册数学一课一练-3.5蚕丝一、单选题1.天天超市一种苹果的价格是每千克7.98元，妈妈买了2.7千克，应付（   ）元。A. 21.546                                       B. 21.55                                       C. 21.62.将8.65×0.3的积保留两位小数，正确结果是（　　）。A. 2.59                                          B. 2.6                                          C. 2.603.0.35×0.2的积化简后是（　　）A. 一位小数                                  B. 两位小数                                  C. 三位小数4.下面的算式中，积不相同的一个算式是(   )。A. 7.4×0.64                           B. 0.74×64                           C. 0.74×6.4                           D. 0.074×645.1.24×0.24的积保留两位小数是（  ）A. 0.29                                      B. 0.30                                      C. 0.3                                      D. 0.03二、判断题6.超市的苹果每千克4.6元，王丽的妈妈买了3.02千克，王丽的妈妈花了多少元？4.6×3.02＝13.892(元).答：王丽的妈妈花了13.892元.7.一个数的12.08倍一定比原数大。8.两个小数相乘的积一定小于1。9.0.05乘一个数，所得的积一定比这个数小．10.列竖式计算小数乘法时，应把因数中的小数点对齐。三、填空题11.一只鸵鸟的身高是2.75米，一只长颈鹿的身高是鸵鸟的2.2倍，这只长颈鹿的身高是________米。12.在横线上填“＜”、“＞”或“＝”．1÷0.7________1        2.5________2.     9.53×6________95.3×0.6    8.3________8.3333…7.23________7.19      0.1×0.99________0.1    6.5________6.50          7.61________7.62÷0.25________2×4    7.2÷1.2________2        0÷2019________2019×013.填表╳7891.21.31.41.51.6 0.1________________________________________________________________0.2________________________________________________________________0.3________________________________________________________________0.4________________________________________________________________0.5________________________________________________________________14.在横线上填上>、