2×5=4.2-1.8=12.5×8=3.54×10=5.2+0.8=
2.15+1.85=0÷0.25=2÷0.4=9÷6=70×50=

2×5=10,4.2-1.8=2.4,12.5×8=100,3.54×10=35.4,5.2+0.8=6,
2.15+1.85=4,0÷0.25=0,2÷0.4=5,9÷6=1.5,70×50=3500.

分析:本題運用小數(shù)乘除法的計算法則進行計算即可.小數(shù)的加減中注意小數(shù)點的位置.
點評:本題運用小數(shù)乘除法的計算法則進行計算即可.
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2×5= 4.2-1.8= 12.5×8= 3.54×10= 5.2+0.8=
2.15+1.85= 0÷0.25= 2÷0.4= 9÷6= 70×50=

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科目:小學數(shù)學 來源: 題型:

口算
(1)70×80=
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5600
        3.7×0.5=
1.85
1.85
     3.2×100=
320
320
      8.9-3.8=
5.1
5.1

(2)3.8+2.5+6.2=
12.5
12.5
    12-6.2-3.8=
2
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   1.7+0.43+3.3=
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5.43
    3.4-1.5-0.5=
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(3)
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9
+
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9
--
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7
=
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7
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7
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180
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81.1
81.1
    
(4)3.14×3=
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10.1
10.1
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0.804
0.804
   
6
13
+
7
13
=
1
1

(5)3.99+5.2=
9.19
9.19
   23+6.68=
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29.68
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0.56
    0.25×0.4=
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0.1

(6)22×0.2=
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10
10
  
(8)340÷17=
20
20
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31
31
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52
52
   3.6×5=
18
18

(9)1.5×4=
6
6
   20×16=
320
320
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84
84
   3.2÷4=
0.8
0.8
 
(10)0.28×100=
28
28
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3.2
3.2
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50
50
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0.5
0.5

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460
460
    
1
4
+
1
2
=
3
4
3
4
   2.5÷5=
0.5
0.5
   4.95×10=
49.5
49.5
   
(12)12-
1
2
-
1
2
=
11
11
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4
4
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0.65
0.65
   12×0.05=
0.6
0.6

(13)3.08÷0.1=
30.8
30.8
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2.1
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50
50
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10
10
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4.7+2.3=4.5×2=6.9-2.5=7.2×0.8=
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