一、口算。
$310 - 90 = $ $780 ÷ 13 = $ $500 ÷ 4 = $
$140 - 78 = $ $207 × 5 = $ $85 ÷ 17 = $
$4500 ÷ 500 = $ $250 + 85 = $ $21 × 40 = $
$16 × 40 = $ $1500 ÷ 30 = $ $810 ÷ 27 = $
$230 ÷ 5 = $ $420 ÷ 42 = $ $21 × 7 = $
$66 + 54 = $ $2400 ÷ 60 = $ $16 × 90 = $
$37 × 6 = $ $150 ÷ 15 = $ $714 ÷ 7 = $
$39 + 258 = $ $61 × 30 = $ $300 ÷ 25 = $

220 60 125 62 1035 5 9 335 840 640 50 30 46 10 147 120 40 1440 222 10 102 297 1830 12

$310 - 90 = 220$
$780 ÷ 13 = 60$
$500 ÷ 4 = 125$
$140 - 78 = 62$
$207 × 5 = 1035$
$85 ÷ 17 = 5$
$4500 ÷ 500 = 9$
$250 + 85 = 335$
$21 × 40 = 840$
$16 × 40 = 640$
$1500 ÷ 30 = 50$
$810 ÷ 27 = 30$
$230 ÷ 5 = 46$
$420 ÷ 42 = 10$
$21 × 7 = 147$
$66 + 54 = 120$
$2400 ÷ 60 = 40$
$16 × 90 = 1440$
$37 × 6 = 222$
$150 ÷ 15 = 10$
$714 ÷ 7 = 102$
$39 + 258 = 297$
$61 × 30 = 1830$
$300 ÷ 25 = 12$

二、用竖式计算,带*的要验算。
$67 ÷ 18$ $940 ÷ 88$ * $178 ÷ 13$



$634 ÷ 21$ $405 ÷ 25$ * $307 ÷ 52$

3……13 10……60 13……9 30……4 16……5 5……47

```
67 ÷ 18 = 3……13
3
18)67
54
---
13
940 ÷ 88 = 10……60
10
88)940
880
---
60
*178 ÷ 13 = 13……9
13
13)178
13
---
48
39
---
9
验算：13×13 + 9 = 169 + 9 = 178
634 ÷ 21 = 30……4
30
21)634
630
---
4
405 ÷ 25 = 16……5
16
25)405
250
---
155
150
---
5
*307 ÷ 52 = 5……47
5
52)307
260
---
47
验算：52×5 + 47 = 260 + 47 = 307
```