1. 直接写出得数。(每题1分,共12分)
$7×80= $
$0×212= $
$900 + 80= $
$600×6= $
$7×80= $
560
$4×300= $1200
$50×8= $400
$0×212= $
0
$29×2= $58
$3×33= $99
$900 + 80= $
980
$60×5= $300
$40×4 + 50= $210
$600×6= $
3600
$44×5= $220
$20 + 80×4= $340
答案
560 1200 400 0 58 99 980 300 210 3600 220 340
2. 列竖式计算。(每题3分,共18分)
$67×8= $
$548×5= $
$67×8= $
536
$4×129= $516
$250×5= $1250
$548×5= $
2740
$4×505= $2020
$418×3= $1254
答案
536 516 1250 2740 2020 1254
解析
```
67
× 8
----
536
129
× 4
----
516
250
× 5
----
1250
548
× 5
----
2740
505
× 4
----
2020
418
× 3
----
1254
```
67
× 8
----
536
129
× 4
----
516
250
× 5
----
1250
548
× 5
----
2740
505
× 4
----
2020
418
× 3
----
1254
```
(1)$21 + 22 + 23 + 24 + 25 = $(
(2)$103 + 104 + 105 + 106 + 107 + 108 + 109 = $(
23
)×(5
) = (115
)(2)$103 + 104 + 105 + 106 + 107 + 108 + 109 = $(
106
)×(7
) = (742
)答案
(1)23 5 115
(2)106 7 742
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