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.
|
(1)21 ×9≈ |
48 ×3≈ |
|
(2)710 ×4≈ |
599 ×2≈ |
计算.
|
(1)580 ×2 |
(2)403 ×7 |
计算.
|
(1)370 ×4 |
(2)290 ×3 |
计算.
|
(1)520 ×7 |
(2)660 ×5 |
计算.
|
(1)430 ×6 |
(2)283 ×5 |