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1. 直接写得数。
$20×30=$
$84÷4=$
$105÷5=$
$280÷2=$
$90×10=$
$\frac{4}{7}-\frac{1}{7}=$
$8.6 + 2.4=$
$410×20=$
$20×30=$
600
$810÷9=$90
$16×40=$640
$400÷4=$100
$84÷4=$
21
$120 - 70=$50
$6×800=$4800
$210÷7=$30
$105÷5=$
21
$18×50=$900
$77÷7=$11
$5×80=$400
$280÷2=$
140
$15×5=$75
$66÷3=$22
$21×30=$630
$90×10=$
900
$480÷8=$60
$40×12=$480
$560÷8=$70
$\frac{4}{7}-\frac{1}{7}=$
$\frac{3}{7}$
$\frac{2}{5}+\frac{3}{5}=$1
$\frac{1}{9}+\frac{7}{9}=$$\frac{8}{9}$
$1-\frac{5}{8}=$$\frac{3}{8}$
$8.6 + 2.4=$
11
$3.1 + 6.9=$10
$0.7 + 0.3=$1
$4.2 + 0.8=$5
$410×20=$
8200
$270×20=$5400
$120×30=$3600
$250×40=$10000
答案
600 90 640 100 21 50 4800 30 21 900 11 400 140 75 22 630 900 60 480 70 $\frac{3}{7}$ 1 $\frac{8}{9}$ $\frac{3}{8}$ 11 10 1 5 8200 5400 3600 10000
2. 用竖式计算。(带“☆”的要验算。)
$525÷5=$
```
105
5)525
5
--
25
25
--
0
```
$57×46=$
```
57
×46
---
342
228
---
2622
```
☆$258÷4=$
```
64
4)258
24
--
18
16
--
2
```
验算：$64×4+2=256+2=258$
$0.4 + 0.8=$
```
0.4
+0.8
---
1.2
```
$10.2 - 8=$
```
10.2
-8.0
---
2.2
```
☆$20 - 8.7=$
```
20.0
-8.7
---
11.3
```
验算：$11.3+8.7=20.0$
$28×307=$
```
307
× 28
-----
2456
614
-----
8596
```
$180×19=$
```
180
×19
---
162
18
---
3420
```
$29×127=$
```
127
× 29
-----
1143
254
-----
3683
```
$525÷5=$
105
```
105
5)525
5
--
25
25
--
0
```
$57×46=$
2622
```
57
×46
---
342
228
---
2622
```
☆$258÷4=$
64……2
```
64
4)258
24
--
18
16
--
2
```
验算：$64×4+2=256+2=258$
$0.4 + 0.8=$
1.2
```
0.4
+0.8
---
1.2
```
$10.2 - 8=$
2.2
```
10.2
-8.0
---
2.2
```
☆$20 - 8.7=$
11.3
```
20.0
-8.7
---
11.3
```
验算：$11.3+8.7=20.0$
$28×307=$
8596
```
307
× 28
-----
2456
614
-----
8596
```
$180×19=$
3420
```
180
×19
---
162
18
---
3420
```
$29×127=$
3683
```
127
× 29
-----
1143
254
-----
3683
```
答案
