口算.
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(1)2 ×4+20= |
(2)26 -36÷6= |
|
(3)3 ×8÷4= |
(4)81 ÷9÷3= |
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(5)3 ×2×4= |
(6)23 +28÷4= |
|
(7)(5 +3)×6= |
(8)24 ÷(21-18)= |
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(9)56 -(30+16)= |
口算.
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(1)36 +22= |
(2)58 -35= |
(3)19 +43= |
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(4)42 -38= |
(5)27 +16= |
(6)86 -32= |
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(7)500 -300= |
(8)400 +580= |
(9)210 -90= |
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(10)70 +600= |
(11)640 -400= |
(12)460 +90= |
口算.
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(1)4 ×6-20= |
(2)34 +63÷9= |
(3)81 ÷9×4= |
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(4)72 ÷8-9= |
(5)15 +5×6= |
(6)56 -30+6= |
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(7)(26 +9)÷7= |
(8)8 ×(35-30)= |
(9)63 ÷(56÷8)= |
把得数直接写在等号后面.
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(1)20 +30= |
(2)38 -8= |
(3)23 +7= |
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(4)87 -6= |
(5)6 +23= |
(6)35 -4= |
直接写出得数.
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(1)40 +20=□ |
(2)70 -60=□ |
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(3)20 +80=□ |
(4)60 -60=□ |
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(5)60 -30=□ |
(6)80 +10=□ |
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(7)50 -50=□ |
(8)90 +10=□ |
口算下面各题.
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(1)1.25 +8.75= |
0.5 +2.55= |
8.04 +0.96= |
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(2)6 -0.5= |
7.1 -2.8= |
12 -7.6= |
口算下面各题.
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(1)0.4 +1.2= |
1.3 -0.9= |
3.2 +4.02= |
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(2)4.6 -2.5= |
1.7 +4.3= |
10.6 -2.7= |
直接写出下面各题的得数.
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(1)17 ×10= |
(2)20 ×20= |
(3)23 ×10= |
(4)9 ×70= |
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(5)25 ×40= |
(6)16 ×50= |
(7)15 ×40= |
(8)36 ×20= |
直接写出下面各题的得数.
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(1)25 ×20= |
(2)40 ×30= |
(3)10 ×98= |
(4)25 +20= |
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(5)30 ×23= |
(6)14 ×20= |
(7)26 -14= |
(8)40 ×11= |
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口算下面各题,你发现了什么巧妙的算法?
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(1)30 ×4= |
30 ×40= |
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(2)50 ×8= |
50 ×80= |
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(3)6 ×20= |
60 ×20= |
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(4)40 ×20= |
40 ×200= |
|
(5)18 ×2= |
18 ×20= |
|
(6)25 ×20= |
25 ×200= |