算一算.
|
605 ×8= |
370 ×9= |
520 ×7= |
比一比,看谁的口算速度快.
|
(1) |
3 ×0= |
12 ×3= |
15 +0= |
| (2) |
18 -6= |
12 ×3= |
100 ×6= |
|
(3) |
120 ×0= |
0 ×9= |
0 ×0= |
口算下面各题.
|
(1)210 ×4= |
340 ×7= |
400 ×9= |
600 ×5= |
|
(2)230 ×3= |
120 ×7= |
50 ×4= |
200 ×5= |
你能快速口算出下面各题吗?
|
(1) |
40 ×2= |
200 ×8= |
| (2) |
6 ×3+5= |
33 ×3= |
|
(3) |
43 ×2= |
1000 ×9= |
口算
|
(1) |
20 ×3= |
100 ×8= |
| (2) |
4 ×3+8= |
11 ×8= |
|
(3) |
10 ×6= |
2000 ×4= |
先估一估,再写下来.
|
37 ×5≈ |
58 ×2≈ |
|
68 ×7≈ |
893 ×3≈ |