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1. 直接写出得数。
80 + 47 =
73 × 10 =
534 + 29 =
53 + 69 + 147 =
76 - 59 =
44 × 50 =
300 - 193 =
138 + 49 - 38 =
400 ÷ 8 =
460 ÷ 23 =
185 ÷ 5 =
360 ÷ 15 ÷ 2 =
29 + 66 =
23 × 60 =
106 × 7 =
79 × 5 × 20 =
25 × 7 =
480 ÷ 60 =
72 × 60 =
31 × (22 + 18) =
4 × 150 =
45 × 20 =
540 ÷ 18 =
720 ÷ 18 ÷ 5 =
30 × 50 =
35 × 30 =
25 × 48 =
49 × 99 + 49 =
630 ÷ 21 =
900 ÷ 20 =
130 × 40 =
138 × 69 ÷ 138 =
80 + 47 =
127
73 × 10 =
730
534 + 29 =
563
53 + 69 + 147 =
269
76 - 59 =
17
44 × 50 =
2200
300 - 193 =
107
138 + 49 - 38 =
149
400 ÷ 8 =
50
460 ÷ 23 =
20
185 ÷ 5 =
37
360 ÷ 15 ÷ 2 =
12
29 + 66 =
95
23 × 60 =
1380
106 × 7 =
742
79 × 5 × 20 =
7900
25 × 7 =
175
480 ÷ 60 =
8
72 × 60 =
4320
31 × (22 + 18) =
1240
4 × 150 =
600
45 × 20 =
900
540 ÷ 18 =
30
720 ÷ 18 ÷ 5 =
8
30 × 50 =
1500
35 × 30 =
1050
25 × 48 =
1200
49 × 99 + 49 =
4900
630 ÷ 21 =
30
900 ÷ 20 =
45
130 × 40 =
5200
138 × 69 ÷ 138 =
69
答案
1. 127 730 563 269 17 2200 107 149 50 20 37 12 95 1380 742 7900 175 8 4320 1240 600 900 30 8 1500 1050 1200 4900 30 45 5200 69
2. 用竖式计算,带☆的要验算。
47 × 423 =
350 × 59 =
☆1908 ÷ 18 =
943 ÷ 23 =
232 ÷ 9 =
☆124 × 21 =
47 × 423 =
19881
350 × 59 =
20650
☆1908 ÷ 18 =
106
943 ÷ 23 =
41
232 ÷ 9 =
25……7
☆124 × 21 =
2604
答案
2. 19881 20650 106 41 25……7 2604 竖式及验算略
解析
```
423
× 47
-----
2961
1692
-----
19881
350
× 59
-----
3150
1750
-----
20650
106
18)1908
18
---
108
108
---
0
验算：
106
× 18
-----
848
106
-----
1908
41
23)943
92
---
23
23
---
0
25
9)232
18
---
52
45
---
7
124
× 21
-----
124
248
-----
2604
验算：
21
×124
-----
84
210
240
-----
2604
```
423
× 47
-----
2961
1692
-----
19881
350
× 59
-----
3150
1750
-----
20650
106
18)1908
18
---
108
108
---
0
验算：
106
× 18
-----
848
106
-----
1908
41
23)943
92
---
23
23
---
0
25
9)232
18
---
52
45
---
7
124
× 21
-----
124
248
-----
2604
验算：
21
×124
-----
84
210
240
-----
2604
```
一块正方形土地,边长增加5千米后,面积增加了105平方千米。原来正方形土地的面积是多少平方千米？
答案
5×5=25(平方千米)(105-25)÷2=40(平方千米)40÷5=8(千米)8×8=64(平方千米)
