1. 直接写出得数。
$12×7=$ $16×6=$ $6×15=$
$30×6=$ $24×2=$ $40×2=$
$12×8=$ $6×6=$ $5×20=$
$15×3=$ $4×30=$ $22×4=$
$6×5+4=$ $8×6+8=$ $5×3+9=$
$8×5+12=$ $6×2+16=$ $40-3×8=$
$80-4×9=$ $8×3+22=$ $7×6+20=$
$4×5+25=$ $8×9-60=$ $7×7+7=$
$12×7=$ $16×6=$ $6×15=$
$30×6=$ $24×2=$ $40×2=$
$12×8=$ $6×6=$ $5×20=$
$15×3=$ $4×30=$ $22×4=$
$6×5+4=$ $8×6+8=$ $5×3+9=$
$8×5+12=$ $6×2+16=$ $40-3×8=$
$80-4×9=$ $8×3+22=$ $7×6+20=$
$4×5+25=$ $8×9-60=$ $7×7+7=$
答案
1. 84 96 90 180 48 80 96 36 100 45 120 88 34 56 24 52 28 16 44 46 62 45 12 56
2. 填一填。
(1) $17×5=□$

$□◯□=□$
(2) $28×3=□$

$□◯□=□$
(3)

(1) $17×5=□$
$□◯□=□$
(2) $28×3=□$
$□◯□=□$
(3)
答案
2. (1) 85 50 35 50+35=85
(2) 84 60 24 60+24=84
(3) 18 300 480 1800 12 200 320 1200 21 350 560 2100
(2) 84 60 24 60+24=84
(3) 18 300 480 1800 12 200 320 1200 21 350 560 2100
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