| 1. | He could add and subtract , but had n't learned to divide .
他会做加减法，但还没有学会除法。 |
| 2. | The little girl has begun to learn to add and subtract
这小女孩已在学做加减法了。 |
| 3. | Students who can not even do simple addition and subtraction
学生们甚至不能计算简单的加减法。 |
| 4. | Addition and subtraction calculation , simple and interesting game
加减法运算，简单而有趣的游戏。 |
| 5. | The danger , students who can not even do simple addition and suppression ( subtraction )
危险是学生们甚至不会简单加减法。 |
| 6. | The danger : students who can not even do simple addition and subtraction
很危险的是，一些学生甚至连简单的加减法都不会做。 |
| 7. | The developmental characteristics of preschoolers ' addition - subtraction cognitive strategies
幼儿加减法运算中的策略发展特点 |
| 8. | He ' s only three , but he can already do simple problem in addition and subtraction
他只有3岁，但他已能做简单的加减法题目了。 |
| 9. | The danger students who can not even do simple addition and subtraction
危险的地方还在于，学生们可能甚至不能做简单的加减法。 |
| 10. | Teaching important points : the essence of subtraction and the relationship between the parts of subtraction
教学重点：减法的意义和加减法的各部分的关系。 |
