一、口算。
$930 - 320 =$
$770 - 90 =$
$8×9 =$
$330 - 60 =$
$3×31 =$
$210 + 120 =$
$360 + 530 =$
$56 - 19 =$
$48÷4 =$
$2×13 =$
$23×2 =$
$44 + 27 =$
$55÷5 =$
$680 + 130 =$
$890 - 650 =$
$600 + 800 =$
$820 - 70 =$
$3×30 =$
$80 - 38 =$
$46 + 24 =$
$840 - 90 =$
$380 + 110 =$
$69÷3 =$
$25 + 38 =$

1. $930 - 320 = 610$
2. $770 - 90 = 680$
3. $8×9 = 72$
4. $330 - 60 = 270$
5. $3×31 = 93$
6. $210 + 120 = 330$
7. $360 + 530 = 890$
8. $56 - 19 = 37$
9. $48÷4 = 12$
10. $2×13 = 26$
11. $23×2 = 46$
12. $44 + 27 = 71$
13. $55÷5 = 11$
14. $680 + 130 = 810$
15. $890 - 650 = 240$
16. $600 + 800 = 1400$
17. $820 - 70 = 750$
18. $3×30 = 90$
19. $80 - 38 = 42$
20. $46 + 24 = 70$
21. $840 - 90 = 750$
22. $380 + 110 = 490$
23. $69÷3 = 23$
24. $25 + 38 = 63$

二、用竖式计算，带 * 的要验算。

```
197
+ 576
------
773
445
97
------
348
364
+ 59
------
423
507
339
------
168
265
+ 368
------
633
634
458
------
176
```