一、口算。
$7×16=$ $200-55=$ $210×4=$
$450+5=$ $72-48=$ $52+138=$
$80-26=$ $126×4=$ $601×4=$
$48+52=$ $25×7=$ $198-89=$
$77+123=$ $400×5=$ $240×4=$
$64-17=$ $240×6=$ $300-82=$
$3\mathrm{千米}500\mathrm{米}=(\quad)\mathrm{米}$ $4600\mathrm{米}-600\mathrm{米}=(\quad)\mathrm{千米}$
$800\mathrm{米}+4200\mathrm{米}=(\quad)\mathrm{千米}$ $2\mathrm{千米}-600\mathrm{米}=(\quad)\mathrm{米}$

1. $7×16=112$
2. $200-55=145$
3. $210×4=840$
4. $450+5=455$
5. $72-48=24$
6. $52+138=190$
7. $80-26=54$
8. $126×4=504$
9. $601×4=2404$
10. $48+52=100$
11. $25×7=175$
12. $198-89=109$
13. $77+123=200$
14. $400×5=2000$
15. $240×4=960$
16. $64-17=47$
17. $240×6=1440$
18. $300-82=218$
19. $3\mathrm{千米}500\mathrm{米}=3500\mathrm{米}$
20. $4600\mathrm{米}-600\mathrm{米}=4\mathrm{千米}$
21. $800\mathrm{米}+4200\mathrm{米}=5\mathrm{千米}$
22. $2\mathrm{千米}-600\mathrm{米}=1400\mathrm{米}$

二、用竖式计算。
$830 - 452 =$

$368 + 246 =$

$709 × 5 =$

$814 × 9 =$
$326 × 5 =$
$615 × 4 =$

1. $830 - 452 = 378$
2. $368 + 246 = 614$
3. $709 × 5 = 3545$
4. $814 × 9 = 7326$
5. $326 × 5 = 1630$
6. $615 × 4 = 2460$