| 1. | Representation formats for addition and multiplication facts
加法和乘法算式的表征方式 |
| 2. | Which calculation will give him this number
哪一个算式将给他这个数字？ |
| 3. | Look at this picture . who can write addition sentences how to make 10
看着这幅图，谁能写出等于10的加法算式呢？ |
| 4. | Look at the three problems . what law can you find ? discuss in pairs
观察这三组算式，你发现了什么规律？同桌讨论。 |
| 5. | 137 and 357 are the addends . the answer 494 is the sum
生： 137和357在加法算式中叫做加数。他们相加的得数494叫做和。 |
| 6. | Risk array algorithm
风险排列算式 |
| 7. | The murderer has run away . the police are searching for him
算式中表示数目的主语通常看作单数，其谓语常用单数形式，也可用复数。 |
| 8. | Look at 5220 145 = 36 . write two related problems : one multiplication , one division
根据5220 145 = 36 ，写出一道乘法算式和一道除法算式。 |
| 9. | What do you call the three numbers 137 , 357 and 494 in this addition problem
师： 137和357在加法算式中叫什么数？他们相加的得数494叫做什么数？ |
| 10. | On [ a , b ] the product l = l2 lt of operator l { and l2 is selfadjoint if and only if 4
讨论一类两个四阶对称微分算式生成的积算子的自伴性； 4 |
