1 直接写出得数。(每题1分,共20分)
$621 + 55 = $ $321×9 = $ $123×80 = $ $180÷5 = $
$97 - 45 = $ $345 + 456 = $ $742 - 48 = $ $654×2 = $
$234×90 = $ $510÷6 = $ $52 + 45 = $ $876 - 234 = $
$960÷8 = $ $956 - 55 = $ $513 + 37 = $ $848 - 628 = $
$25×40 = $ $76 + 211 = $ $425 + 10 = $ $25×8×2 = $

676 2889 9840 36
52 801 694 1308
21060 85 97 642
120 901 550 220
1000 287 435 400

2 列竖式计算,带※的要验算。(每题3分,共12分)
$424×60 = $ $4700÷500 = $ $208×34 = $ ※$651÷32 = $

竖式及验算略
25440 9……200
7072 20……11

3 计算下面各题,能简算的要简算。(每题3分,共18分)
$180÷(19 + 11)×2$ $824 - 224 - 178 - 122$ $466 - (66 + 125)$
$547 - (32 + 247)$ $206×14 + 94×14$ $8×(27×5)$

12 300 275
268 4200 1080