www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com2.下面的说法正确吗?正确的画“√”,错误的画“×”。(1)小数一定比整数小。()(2)0.35里面只有5个0.01。()(3)小数部分最大的计数单位是十分之一。()(4)由3个0.001和8个0.01组成的小数是0.083。()××√√巩固练习二
www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com2.下面的说法正确吗?正确的画“√”,错误的画“×”。(5)最大的一位小数是0.9。()(6)0.2和0.20大小相等,意义相同。()(7)2.73去掉小数点后所得的数是原数的100倍。()(8)3.009保留一位小数是3.1。()××√×巩固练习二
3.在里填上合适的数,并说一说分别应用了哪些运算定律。(1)3.6+8.59+6.4=3.6++8.59(2)(25.8+7.5)+2.5=+(+)(3)42×4×25=×(×)(4)(125+70)×8=8×+8×(5)(b+20)×3=×+×6.4加法交换律25.87.52.5加法结合律42425乘法结合律12570乘法分配律b3203乘法分配律这些运算定律,你会用字母表示吗?巩固练习二教材P111T2
巩固练习二教材P111T4(1)答:白菜比萝卜多卖30.7元。(2)答:共卖127.8元。
150.040.03100巩固练习二教材P112T5
巩固练习二教材P112T76.
www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com7.计算下面各题。(1)45.36-18.72+5.68=26.64+5.68=32.32巩固练习二(2)92.3-(84.5-45.65)=92.3-38.85=53.45
www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com(3)13.27-(2.46+5.27)=13.27-5.27-2.46=8-2.46=5.54巩固练习二7.计算下面各题。
www.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.comwww.youyi100.com(4)4.8-3.72-0.28+0.2=4.8-(3.72+0.28)+0.2=4.8-4+0.2=0.8+0.2=1巩固练习二7.计算下面各题。