Key Words/Phrases: 

Group, digit, tens, ones, greatest, groups of ten, left over, altogether

Key Sentences:

1. How many … are left over here? There are … left over here.

Ø How many apples are left over here?

Ø There are three apples left over here.

2. How many groups of ten … are here and how many … are left over?

Ø How many groups of ten apples are here and how many apples are left over?

Ø There are 4 groups of ten apples and 3 apples left over.

3. What’s the greatest number of groups of ten in …? The greatest number of groups of ten is…

Ø What’s the greatest number of groups of ten in 57?

Ø The greatest number of groups of ten is 5.

Why?

-Because 50 is made up of 5 groups of 10. 60 is made up of 6 groups of 10. The greatest number of groups of ten in 57 is 5.

(这是一个帮孩子们思维外化的过程，所以可以让孩子多练习几遍哦）

4. How many tens and how many ones are there in the number …? There are … tens and … ones in the number…

Ø How many tens and how many ones are there in the number 34?

Ø There are 3 tens and 4 ones in the number 34.

5. Which number is made up of … tens and … ones? … is made up of … tens and … ones.

Ø Which number is made up of 4 tens and 3 ones? 43 is made up of 4 tens and 3 ones.

6. The digits are 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9.

7. Every digit is a number. Numbers like 1, 2, 3 are all one-digit numbers.

8. Number 34 has two digits. The digit 3 on the left shows how many tens are in 34. The digit 4 on the right shows how many ones are in 34.

Exercise:

1. Write down the number for each word name, and write down the word name of each number.

e.g.  ninety-eight     98                    34   thirty-four   

fifty-one               sixteen               seventy-two          

forty-four              twelve               thirty-nine            

28                     11                      45                 

67                     19                      93                 

74                     30                      82                 

2. How many groups of tens and ones are there in each number?

e.g., 48: There are 4 groups of tens and 8 ones in the number 48.

52:                                                           

71:                                                         

26:                                                           

49:                                                        

3. Write down the number and the word.

e.g., Which number has 2 tens and 3 ones?                   23    twenty-three                

Ø Which number has 3 tens and 8 ones?                                

Ø Which number has 4 tens and 9 ones?                                

Ø Which number has 6 tens and 5 ones?                                

Ø Which number has 7 tens and 6 ones?                 

Ø Which number has 9 tens and 1 one?                                 

4. Identify the value of each place in the following numbers.

e.g., The digit 2 in 62 is in the place of   ones  .

The digit 6 in 62 is in the place of   tens  .

62= six tens and two ones

Ø The digit 1 in 31 is in the place of          .

The digit 3 in 31 is in the place of          .

31=                                          

Ø The digit 5 in 25 is in the place of          .

The digit 2 in 25 is in the place of          .

25=                                          

Homework:

1. Reference: Classroom Connection Book I Page 87-91.

2. Written assignment: Finish the exercise above.

3. Oral assignment: Read the key words and key sentences.  

数学课教学目标：

1、数学学科知识：结合课件和教师引导了解group （集合），left over（剩余量）概念

2、数学学科思维：对比不同集合的计数，并强化关于集合以及剩余量的概念认识，并进行数学语言输出：

3.积累和数学相关的关键词

课后作业：