三、算一算。
1.直接写出得数。
$40 ÷ 4 =$
$46 ÷ 2 =$
$360 ÷ 9 =$
$2400 ÷ 6 =$
$120 ÷ 6 =$
$96 ÷ 3 =$
$0 ÷ 79 =$
$36 ÷ 3 × 2 =$
$454 ÷ 9 \approx$
$97 ÷ 5 \approx$
$310 ÷ 4 \approx$
$200 ÷ 3 \approx$
1.直接写出得数。
$40 ÷ 4 =$
$46 ÷ 2 =$
$360 ÷ 9 =$
$2400 ÷ 6 =$
$120 ÷ 6 =$
$96 ÷ 3 =$
$0 ÷ 79 =$
$36 ÷ 3 × 2 =$
$454 ÷ 9 \approx$
$97 ÷ 5 \approx$
$310 ÷ 4 \approx$
$200 ÷ 3 \approx$
答案
40 ÷ 4 = 10
46 ÷ 2 = 23
360 ÷ 9 = 40
2400 ÷ 6 = 400
120 ÷ 6 = 20
96 ÷ 3 = 32
0 ÷ 79 = 0
36 ÷ 3 × 2 = 24
454 ÷ 9 ≈ 50
97 ÷ 5 ≈ 20
310 ÷ 4 ≈ 80
200 ÷ 3 ≈ 70
46 ÷ 2 = 23
360 ÷ 9 = 40
2400 ÷ 6 = 400
120 ÷ 6 = 20
96 ÷ 3 = 32
0 ÷ 79 = 0
36 ÷ 3 × 2 = 24
454 ÷ 9 ≈ 50
97 ÷ 5 ≈ 20
310 ÷ 4 ≈ 80
200 ÷ 3 ≈ 70
2. 列竖式计算。(带*的要验算)
561 ÷ 3 =
524. ÷ 4 =
684. ÷ 6 =
561 ÷ 3 =
524. ÷ 4 =
684. ÷ 6 =
答案
561 ÷ 3 = 187
```
1 8 7
_______
3 | 5 6 1
3
_______
2 6
2 4
_______
2 1
2 1
_______
0
```
---
*524 ÷ 4 = 131
```
1 3 1
_______
4 | 5 2 4
4
_______
1 2
1 2
_______
4
4
_______
0
```
验算:
```
1 3 1
× 4
_______
5 2 4
```
---
*684 ÷ 6 = 114
```
1 1 4
_______
6 | 6 8 4
6
_______
8
6
_______
2 4
2 4
_______
0
```
验算:
```
1 1 4
× 6
_______
6 8 4
```
```
1 8 7
_______
3 | 5 6 1
3
_______
2 6
2 4
_______
2 1
2 1
_______
0
```
---
*524 ÷ 4 = 131
```
1 3 1
_______
4 | 5 2 4
4
_______
1 2
1 2
_______
4
4
_______
0
```
验算:
```
1 3 1
× 4
_______
5 2 4
```
---
*684 ÷ 6 = 114
```
1 1 4
_______
6 | 6 8 4
6
_______
8
6
_______
2 4
2 4
_______
0
```
验算:
```
1 1 4
× 6
_______
6 8 4
```
3.脱式计算。
$210÷5×8$
$270÷9×2$
$540÷2×3$
$210÷5×8$
$270÷9×2$
$540÷2×3$
答案
$210÷5×8$
$=42×8$
$=336$
$270÷9×2$
$=30×2$
$=60$
$540÷2×3$
$=270×3$
$=810$
$=42×8$
$=336$
$270÷9×2$
$=30×2$
$=60$
$540÷2×3$
$=270×3$
$=810$
四、解决问题。
1.哪家超市的茶叶便宜些?

1.哪家超市的茶叶便宜些?
答案
1. 甲超市: 918÷(8+1)=102(元/罐)
乙超市:720÷6=120(元/罐)
102 < 120,甲超市便宜。
乙超市:720÷6=120(元/罐)
102 < 120,甲超市便宜。
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