1. 两个数相除,商是80,被除数扩大为原来的10倍,除数不变,那么商是(
A.80
B.800
C.8
B
)。A.80
B.800
C.8
答案:
B
2.$2700 ÷ 400 = 6 ·s ·s$(
A.3
B.30
C.300
C
)。A.3
B.30
C.300
答案:
C
3. 下面的算式中与算式$780 ÷ 60$的计算结果不相同的是(
A.$78 ÷ 6$
B.$156 ÷ 12$
C.$390 ÷ 20$
C
)。A.$78 ÷ 6$
B.$156 ÷ 12$
C.$390 ÷ 20$
答案:
C
4. 下面的算式中,商最小的是(
A.$256 ÷ 16$
B.$256 ÷ 32$
C.$128 ÷ 32$
C
)。A.$256 ÷ 16$
B.$256 ÷ 32$
C.$128 ÷ 32$
答案:
C
1. 口算。
$210 ÷ 30 =$
$810 ÷ 90 =$
$900 ÷ 10 =$
$210 ÷ 30 =$
7
$480 ÷ 80 =$6
$540 ÷ 60 =$9
$600 ÷ 12 =$50
$810 ÷ 90 =$
9
$16 × 60 =$960
$320 ÷ 40 =$8
$54 ÷ 18 =$3
$900 ÷ 10 =$
90
$600 ÷ 40 =$15
$120 ÷ 24 =$5
$480 ÷ 12 =$40
答案:
210 ÷ 30 = 7
480 ÷ 80 = 6
540 ÷ 60 = 9
600 ÷ 12 = 50
810 ÷ 90 = 9
16 × 60 = 960
320 ÷ 40 = 8
54 ÷ 18 = 3
900 ÷ 10 = 90
600 ÷ 40 = 15
120 ÷ 24 = 5
480 ÷ 12 = 40
480 ÷ 80 = 6
540 ÷ 60 = 9
600 ÷ 12 = 50
810 ÷ 90 = 9
16 × 60 = 960
320 ÷ 40 = 8
54 ÷ 18 = 3
900 ÷ 10 = 90
600 ÷ 40 = 15
120 ÷ 24 = 5
480 ÷ 12 = 40
2. 列竖式计算(带★的要验算)。
$8200 ÷ 300 =$ ★$887 ÷ 29 =$ $3400 ÷ 85 =$ ★$6320 ÷ 61 =$
```
27
300)8200
-6000
------
2200
-2100
------
100
```
8200÷300=27……100
★```
30
29)887
-870
------
17
```
887÷29=30……17
验算:
```
29
×30
----
870
+17
----
887
```
```
40
85)3400
-3400
------
0
```
3400÷85=40
★```
103
61)6320
-61
------
220
-183
------
37
```
6320÷61=103……37
验算:
```
103
× 61
----
103
6180
----
6283
+ 37
----
6320
```
$8200 ÷ 300 =$ ★$887 ÷ 29 =$ $3400 ÷ 85 =$ ★$6320 ÷ 61 =$
```
27
300)8200
-6000
------
2200
-2100
------
100
```
8200÷300=27……100
★```
30
29)887
-870
------
17
```
887÷29=30……17
验算:
```
29
×30
----
870
+17
----
887
```
```
40
85)3400
-3400
------
0
```
3400÷85=40
★```
103
61)6320
-61
------
220
-183
------
37
```
6320÷61=103……37
验算:
```
103
× 61
----
103
6180
----
6283
+ 37
----
6320
```
答案:
8200 ÷ 300
```
27
300)8200
-6000
------
2200
-2100
------
100
```
8200÷300=27……100
★887 ÷ 29
```
30
29)887
-870
------
17
```
887÷29=30……17
验算:
```
29
×30
----
870
+17
----
887
```
3400 ÷ 85
```
40
85)3400
-3400
------
0
```
3400÷85=40
★6320 ÷ 61
```
103
61)6320
-61
------
220
-183
------
37
```
6320÷61=103……37
验算:
```
103
× 61
----
103
6180
----
6283
+ 37
----
6320
```
```
27
300)8200
-6000
------
2200
-2100
------
100
```
8200÷300=27……100
★887 ÷ 29
```
30
29)887
-870
------
17
```
887÷29=30……17
验算:
```
29
×30
----
870
+17
----
887
```
3400 ÷ 85
```
40
85)3400
-3400
------
0
```
3400÷85=40
★6320 ÷ 61
```
103
61)6320
-61
------
220
-183
------
37
```
6320÷61=103……37
验算:
```
103
× 61
----
103
6180
----
6283
+ 37
----
6320
```
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