一、口算。
$46 - 17 =$
$2 × 19 =$
$25 × 6 =$
$3 × 402 =$
$18 + 68 =$
$35 + 15 =$
$106 × 7 =$
$72 - 24 =$
$440 × 2 =$
$72 × 3 =$
$647 - 0 =$
$100 - 78 =$
$400 × 8 =$
$380 - 20 =$
$130 × 3 =$
$360 × 5 =$
$273 + 90 =$
$32 + 240 =$
$9 × 108 =$
$1000 - 700 =$
$392 + 511 =$
$9 × 300 =$
$972 - 782 =$
$128 × 3 =$

1. 46-17=29
2. 2×19=38
3. 25×6=150
4. 3×402=1206
5. 18+68=86
6. 35+15=50
7. 106×7=742
8. 72-24=48
9. 440×2=880
10. 72×3=216
11. 647-0=647
12. 100-78=22
13. 400×8=3200
14. 380-20=360
15. 130×3=390
16. 360×5=1800
17. 273+90=363
18. 32+240=272
19. 9×108=972
20. 1000-700=300
21. 392+511=903
22. 9×300=2700
23. 972-782=190
24. 128×3=384

二、用竖式计算。
$193×8=$

$546×9=$

$208×4=$

$822×5=$
$201×3=$
$340×8=$

1. 193×8=1544
2. 546×9=4914
3. 208×4=832
4. 822×5=4110
5. 201×3=603
6. 340×8=2720