一、口算。
$34×3=$
$900×5=$
$5×90=$
$900×3=$
$900×9=$
$14×8=$
$5×400=$
$9×700=$
$50×8=$
$45×2=$
$6×800=$
$32×4=$
$600×4=$
$18×6=$
$75×2=$
$23×4=$
$1+2×5=$
$4×7+3=$
$8+4×2=$
$6×7+7=$
$4+8×5=$
$9×6+6=$
$2+5×7=$
$8×8+8=$
$34×3=$
$900×5=$
$5×90=$
$900×3=$
$900×9=$
$14×8=$
$5×400=$
$9×700=$
$50×8=$
$45×2=$
$6×800=$
$32×4=$
$600×4=$
$18×6=$
$75×2=$
$23×4=$
$1+2×5=$
$4×7+3=$
$8+4×2=$
$6×7+7=$
$4+8×5=$
$9×6+6=$
$2+5×7=$
$8×8+8=$
答案
1. $34×3=102$
2. $900×5=4500$
3. $5×90=450$
4. $900×3=2700$
5. $900×9=8100$
6. $14×8=112$
7. $5×400=2000$
8. $9×700=6300$
9. $45×2=90$
10. $6×800=4800$
11. $32×4=128$
12. $600×4=2400$
13. $18×6=108$
14. $75×2=150$
15. $23×4=92$
16. $1+2×5=11$
17. $4×7+3=31$
18. $8+4×2=16$
19. $6×7+7=49$
20. $4+8×5=44$
21. $9×6+6=60$
22. $2+5×7=37$
23. $8×8+8=72$
2. $900×5=4500$
3. $5×90=450$
4. $900×3=2700$
5. $900×9=8100$
6. $14×8=112$
7. $5×400=2000$
8. $9×700=6300$
9. $45×2=90$
10. $6×800=4800$
11. $32×4=128$
12. $600×4=2400$
13. $18×6=108$
14. $75×2=150$
15. $23×4=92$
16. $1+2×5=11$
17. $4×7+3=31$
18. $8+4×2=16$
19. $6×7+7=49$
20. $4+8×5=44$
21. $9×6+6=60$
22. $2+5×7=37$
23. $8×8+8=72$
二、用竖式计算。
$324×2=$

$812×3=$

$914×6=$

$234×4=$
$156×5=$
$314×4=$
$324×2=$
$812×3=$
$914×6=$
$234×4=$
$156×5=$
$314×4=$
答案
1. $324×2=648$
2. $812×3=2436$
3. $914×6=5484$
4. $234×4=936$
5. $156×5=780$
6. $314×4=1256$
2. $812×3=2436$
3. $914×6=5484$
4. $234×4=936$
5. $156×5=780$
6. $314×4=1256$
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