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1. 直接写出得数。
200 - 33 =
85 - 17 =
428 - 199 =
45 × 3 × 2 =
39 + 46 =
620 + 19 =
980 ÷ 14 =
175 + 39 + 25 =
5 × 108 =
450 ÷ 5 =
300 ÷ 60 =
243 - (43 + 68) =
400 ÷ 20 =
36 × 4 =
118 × 20 =
68 ÷ 34 × 10 =
84 ÷ 21 =
20 × 60 =
38 × 50 =
210 ÷ (69 - 39) =
35 × 2 =
390 ÷ 39 =
535 ÷ 5 =
630 ÷ 3 - 100 =
130 × 10 =
24 × 20 =
804 ÷ 3 =
90 × 20 ÷ 30 =
28 × 3 =
840 ÷ 60 =
8 × 160 =
(49 + 14) ÷ 7 =
200 - 33 =
167
85 - 17 =
68
428 - 199 =
229
45 × 3 × 2 =
270
39 + 46 =
85
620 + 19 =
639
980 ÷ 14 =
70
175 + 39 + 25 =
239
5 × 108 =
540
450 ÷ 5 =
90
300 ÷ 60 =
5
243 - (43 + 68) =
132
400 ÷ 20 =
20
36 × 4 =
144
118 × 20 =
2360
68 ÷ 34 × 10 =
20
84 ÷ 21 =
4
20 × 60 =
1200
38 × 50 =
1900
210 ÷ (69 - 39) =
7
35 × 2 =
70
390 ÷ 39 =
10
535 ÷ 5 =
107
630 ÷ 3 - 100 =
110
130 × 10 =
1300
24 × 20 =
480
804 ÷ 3 =
268
90 × 20 ÷ 30 =
60
28 × 3 =
84
840 ÷ 60 =
14
8 × 160 =
1280
(49 + 14) ÷ 7 =
9
答案
1. 167 68 229 270 85 639 70 239 540 90 5 132 20 144 2360 20 4 1200 1900 7 70 10 107 110 1300 480 268 60 84 14 1280 9
2. 用竖式计算,带☆的要验算。
198 × 13 =
139 × 50 =
☆899 ÷ 29 =
425 ÷ 17 =
9430 ÷ 23 =
☆39 × 308 =
198 × 13 =
2574
139 × 50 =
6950
☆899 ÷ 29 =
31
425 ÷ 17 =
25
9430 ÷ 23 =
410
☆39 × 308 =
12012
答案
2. 2574 6950 31 25 410 12012 竖式及验算略
解析
```
198
× 13
-----
594
1980
-----
2574
139
× 50
-----
6950
31
29)899
87
---
29
29
---
0
验算：
29
× 31
-----
29
870
-----
899
25
17)425
34
---
85
85
---
0
410
23)9430
92
---
23
23
---
0
308
× 39
-----
2772
9240
-----
12012
验算：
308
39)12012
117
---
312
312
---
0
```
198
× 13
-----
594
1980
-----
2574
139
× 50
-----
6950
31
29)899
87
---
29
29
---
0
验算：
29
× 31
-----
29
870
-----
899
25
17)425
34
---
85
85
---
0
410
23)9430
92
---
23
23
---
0
308
× 39
-----
2772
9240
-----
12012
验算：
308
39)12012
117
---
312
312
---
0
```
用 1、2、5、8 和 4 个 0 组数(每个数字都用上且只能用 1 次),组成的最大的八位数是(
85210000
);如果把这个八位数扩大到原来的100 倍,再改写成用“亿”作单位的数,应是(85.21
)亿。答案
85210000 85.21
