四年级数学下册第六单元小数加减法练习题一、口算2.6l.41.90.8l0.580.421.631.230.90.259.90.0142.33.2一1.77.050.050.780.383.5十5.55.53.9二、用竖式计算并验算8.429.4842.563.12491.2630.35 验算: 验算: 验算: 15.6十0.2378052.l7.351.41 验算: 验算: 验算:三、用小数计算2吨50千克十630千克5米80厘米十4米15厘米5元6角十8元3角四、选择题1.用“米”作单位计算,“ 8米6厘米十5米60厘米”的正确算式是()。A.8.65.6B.8.065.06C.8.065.62.减数增加5.6,被减数不变,差()。A.增加5.6B.减少5.6C.不变3.两个小数相加,一个加数增加0.7,另一个加数减少3.6,和()。A.增加4.3B.增加2.9C.减少2.94.8.48(0.653.48)()A.8.480.653.48B.8.483.480.65C.8.483.480.65