1. 直接写出得数。
94 - 49 =
130 - 57 =
608 ÷ 4 =
12 × (80 ÷ 16) =
77 - 18 =
21 × 50 =
820 ÷ 4 =
(144 - 120) ÷ 12 =
43 - 27 =
129 ÷ 3 =
75 × 80 =
175 - (75 + 34) =
20 + 65 =
300 ÷ 6 =
26 × 50 =
36 × 20 ÷ 8 =
100 × 90 =
94 × 2 =
380 ÷ 19 =
8 × 9 × 125 =
800 ÷ 50 =
600 ÷ 200 =
550 ÷ 50 =
72 - 54 ÷ 18 =
140 × 4 =
208 ÷ 8 =
23 × 80 =
287 - 36 - 44 =
85 × 6 =
24 × 60 =
360 ÷ 12 =
99 × 28 + 28 =
94 - 49 =
45
130 - 57 =
73
608 ÷ 4 =
152
12 × (80 ÷ 16) =
60
77 - 18 =
59
21 × 50 =
1050
820 ÷ 4 =
205
(144 - 120) ÷ 12 =
2
43 - 27 =
16
129 ÷ 3 =
43
75 × 80 =
6000
175 - (75 + 34) =
66
20 + 65 =
85
300 ÷ 6 =
50
26 × 50 =
1300
36 × 20 ÷ 8 =
90
100 × 90 =
9000
94 × 2 =
188
380 ÷ 19 =
20
8 × 9 × 125 =
9000
800 ÷ 50 =
16
600 ÷ 200 =
3
550 ÷ 50 =
11
72 - 54 ÷ 18 =
69
140 × 4 =
560
208 ÷ 8 =
26
23 × 80 =
1840
287 - 36 - 44 =
207
85 × 6 =
510
24 × 60 =
1440
360 ÷ 12 =
30
99 × 28 + 28 =
2800
答案
45 73 152 60 59 1050 205 2 16 43 6000 66 85 50 1300 90 9000 188 20 9000 16 3 11 69 560 26 1840 207 510 1440 30 2800
2. 用竖式计算。
250 × 52 =
607 × 23 =
980 ÷ 28 =
156 × 43 =
315 ÷ 45 =
624 ÷ 24 =
250 × 52 =
13000
607 × 23 =
13961
980 ÷ 28 =
35
156 × 43 =
6708
315 ÷ 45 =
7
624 ÷ 24 =
26
答案
250×52=13000 607×23=13961 980÷28=35 156×43=6708 315÷45=7 624÷24=26 竖式略
解析
```
250
× 52
-----
500
12500
-----
13000
607
× 23
-----
1821
12140
-----
13961
35
28)980
84
---
140
140
---
0
156
× 43
-----
468
6240
-----
6708
7
45)315
315
---
0
26
24)624
48
---
144
144
---
0
```
250
× 52
-----
500
12500
-----
13000
607
× 23
-----
1821
12140
-----
13961
35
28)980
84
---
140
140
---
0
156
× 43
-----
468
6240
-----
6708
7
45)315
315
---
0
26
24)624
48
---
144
144
---
0
```
3. 按要求填数。
(1)2.45>2.□6,□里最大填(
(2)6□278≈6.7 万,□里填(
(3)一个两位小数精确到十分位是 10.0,这个两位小数最大是(
(1)2.45>2.□6,□里最大填(
3
);2.47<□.5,□里最小填(2
)。(2)6□278≈6.7 万,□里填(
7
),60□11≈6.0 万,□里最小填(0
)。(3)一个两位小数精确到十分位是 10.0,这个两位小数最大是(
10.04
),最小是(9.95
)。一个三位小数精确到十分位是 10.0,这个三位小数最大是(10.049
),最小是(9.950
)。答案
(1)3 2
(2)7 0
(3)10.04 9.95 10.049 9.950
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