一、口算。
$430 + 80 = $
$19×200 = $
$440 - 120 = $
$906÷6 = $
$85×40 = $
$502×2 = $
$600÷15 = $
$600 + 300 = $
$430 + 80 = $
510
$21×40 = $840
$3000 + 500 = $3500
$19×200 = $
3800
$450 - 36 = $414
$480÷8 = $60
$440 - 120 = $
320
$900×60 = $54000
$1300 - 800 = $500
$906÷6 = $
151
$800÷5 = $160
$95×2 = $190
$85×40 = $
3400
$770 - 180 = $590
$540 - 38 = $502
$502×2 = $
1004
$390 + 11 = $401
$240÷20 = $12
$600÷15 = $
40
$3000÷600 = $5
$4×203 = $812
$600 + 300 = $
900
$320÷16 = $20
$140×3 = $420
答案
510 840 3500
3800 414 60
320 54000 500
151 160 190
3400 590 502
1004 401 12
40 5 812
900 20 420
3800 414 60
320 54000 500
151 160 190
3400 590 502
1004 401 12
40 5 812
900 20 420
二、计算下面涂色部分的面积。


答案
(6+12)×6÷2=54(dm²)
6×3÷2=9(m²)
6×3÷2=9(m²)
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