9．某件商品按原价六折出售时18元，亏2元，如果按原价卖可以赚（ ）元．
| A． | 12 | B． | 20 | C． | 30 | D． | 10 |
4．用竖式计算，带★要验算．
| 47×40= | 49×62= | ★38×11= |
| 20×37= | 52×25= | ★34×55= |
3．直接写得数．
0 133523 133531 133537 133541 133547 133549 133553 133559 133561 133567 133573 133577 133579 133583 133589 133591 133597 133601 133603 133607 133609 133613 133615 133617 133618 133619 133621 133622 133623 133625 133627 133631 133633 133637 133639 133643 133649 133651 133657 133661 133663 133667 133673 133679 133681 133687 133691 133693 133699 133703 133709 133717 199269
| 40×5= | 37+18= | 40×20= | 100-3= |
| 6×5+30= | 30×10= | 60×50= | 62×0= |
| 8×50= | 2×10×10= | 300×8= | 40×50= |
| 204÷2= | 7×15= | 22×10×0=． |