1. 直接写出得数。(32☆)
$2×3 = $ $5×5 = $ $2×5 = $ $4×5 = $
$20×3 = $ $5×50 = $ $20×5 = $ $4×50 = $
$200×3 = $ $5×500 = $ $200×5 = $ $4×500 = $
$3×4 = $ $7×6 = $ $5×6 = $ $8×5 = $
$3×40 = $ $70×6 = $ $5×60 = $ $80×5 = $
$3×400 = $ $700×6 = $ $5×600 = $ $800×5 = $
$30×4 = $ $7×60 = $ $50×6 = $ $8×50 = $
$300×4 = $ $7×600 = $ $500×6 = $ $8×500 = $

6 25 10 20
60 250 100 200
600 2500 1000 2000
12 42 30 40
120 420 300 400
1200 4200 3000 4000
120 420 300 400
1200 4200 3000 4000

2. 计算下面各题。(18☆)
$(74 + 26)×3$ $300×(27÷3)$ $9×30 - 30$
$20×5 - 14$ $90÷3×8$ $81÷9×50$
$5×80×9$ $(109 - 59)×7$ $300×3 - 333$

300 2700 240
86 240 450
3600 350 567