1. 直接写出得数。
$40÷4= $
$640÷2= $
$25×40= $
$\frac{9}{10}+\frac{1}{10}= $
$9.5 - 7.5= $
$4.7 - 1.5= $
$40÷4= $
10
$50÷5= $10
$80÷2= $40
$46÷2= $23
$640÷2= $
320
$120÷4= $30
$125÷5= $25
$510÷3= $170
$25×40= $
1000
$18×20= $360
$376×10= $3760
$212×30= $6360
$\frac{9}{10}+\frac{1}{10}= $
1
$\frac{7}{9}-\frac{2}{9}= $$\frac{5}{9}$
$\frac{1}{5}+\frac{4}{5}= $1
$1-\frac{1}{8}= $$\frac{7}{8}$
$9.5 - 7.5= $
2
$2.5 + 1.2= $3.7
$8.5 - 6.3= $2.2
$5.9 + 0.1= $6
$4.7 - 1.5= $
3.2
$2.2 + 4.6= $6.8
$3.2 - 2.3= $0.9
$6.8 + 3.2= $10
答案
10;10;40;23;320;30;25;170;1000;360;3760;6360;1;$\frac{5}{9}$;1;$\frac{7}{8}$;2;3.7;2.2;6;3.2;6.8;0.9;10
2. 列竖式计算,并验算。
$96÷16=$
竖式:
``` 6
16)96
96
0
```
验算:$16 × 6 = 96$
$75÷12=$
竖式:
``` 6
12)75
72
3
```
验算:$12 × 6 + 3 = 75$
$572÷11=$
竖式:
``` 52
11)572
55
22
22
0
```
验算:$11 × 52 = 572$
$248÷12=$
竖式:
``` 20
12)248
240
8
```
验算:$12 × 20 + 8 = 248$
$89×15=$
竖式:
``` 89
x 15
----
445
+890
----
1335
```
$37×24=$
竖式:
``` 37
x 24
----
148
+740
----
888
```
$432×12=$
竖式:
``` 432
x 12
-----
864
+4320
-----
5184
```
$264×21=$
竖式:
``` 264
x 21
-----
264
+5280
-----
5544
```
$4.5 + 2.4=$
竖式:
```
4.5
+ 2.4
-----
6.9
```
$2.8 - 1.6=$
竖式:
```
2.8
- 1.6
-----
1.2
```
$1.2 - 0.4=$
竖式:
```
1.2
- 0.4
-----
0.8
```
$6.2 + 3.9=$
竖式:
```
6.2
+ 3.9
-----
10.1
```
$96÷16=$
6
竖式:
``` 6
16)96
96
0
```
验算:$16 × 6 = 96$
$75÷12=$
6……3
竖式:
``` 6
12)75
72
3
```
验算:$12 × 6 + 3 = 75$
$572÷11=$
52
竖式:
``` 52
11)572
55
22
22
0
```
验算:$11 × 52 = 572$
$248÷12=$
20……8
竖式:
``` 20
12)248
240
8
```
验算:$12 × 20 + 8 = 248$
$89×15=$
1335
竖式:
``` 89
x 15
----
445
+890
----
1335
```
$37×24=$
888
竖式:
``` 37
x 24
----
148
+740
----
888
```
$432×12=$
5184
竖式:
``` 432
x 12
-----
864
+4320
-----
5184
```
$264×21=$
5544
竖式:
``` 264
x 21
-----
264
+5280
-----
5544
```
$4.5 + 2.4=$
6.9
竖式:
```
4.5
+ 2.4
-----
6.9
```
$2.8 - 1.6=$
1.2
竖式:
```
2.8
- 1.6
-----
1.2
```
$1.2 - 0.4=$
0.8
竖式:
```
1.2
- 0.4
-----
0.8
```
$6.2 + 3.9=$
10.1
竖式:
```
6.2
+ 3.9
-----
10.1
```
答案
3. 脱式计算。
$378 - 29 + 255$ $(428 - 356)÷9$ $184 + 246×3$
$378 - 29 + 255$ $(428 - 356)÷9$ $184 + 246×3$
答案
378 - 29 + 255
= 349 + 255
= 604
(428 - 356)÷9
= 72÷9
= 8
184 + 246×3
= 184 + 738
= 922
= 349 + 255
= 604
(428 - 356)÷9
= 72÷9
= 8
184 + 246×3
= 184 + 738
= 922
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