列豎式計(jì)算并演算.
8+6.5=

10-0.9=

653÷5=

192÷3=
分析:①②小數(shù)的加減,首先把小數(shù)點(diǎn)對(duì)齊,數(shù)位也就對(duì)齊了.用減法進(jìn)行驗(yàn)算.③④是小數(shù)除法計(jì)算,商的小數(shù)點(diǎn)與被除數(shù)的小數(shù)點(diǎn)對(duì)齊.除法用乘法進(jìn)行驗(yàn)算.
解答:解:①8+6.5=14.5;
 8
+6.5

_________
   14.5
驗(yàn)算:
 14.5
-  6.5

_________
      8.0
②10-0.9=9.1;
 10
-  0.9

_________
      9.1
驗(yàn)算:
 0.9
+9.1

___________
    10.0
③653÷5=130.6;
      130.6
   
5653

      5
___________
      15
      15
___________
         30
         30
____________
           0
驗(yàn)算:
    
130.6
×5

_______________
       653.0
④192÷3=64;
        64
     
3192

       18
____________
        12
        12
_______________
         0
驗(yàn)算:
   
64
×3

___________
    1 9 2
點(diǎn)評(píng):本題考查了學(xué)生的計(jì)算能力,小數(shù)的加減,小數(shù)點(diǎn)要對(duì)齊,小數(shù)的除法,商的小數(shù)點(diǎn)與被除數(shù)的小數(shù)點(diǎn)要對(duì)齊.
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