1. T:There are forty-five exercise books on the desk,please give out after the class, all right?

(导入 give out,all right-give out apples/books/pens/pencils左右手操练轮流单词)

2. T: Now,you sit on the chair, I stand on the floor.

(导入 floor)

3. 复习单词:give out,all right, floor, begin(Borm游戏)

4. T：How many students are there in our classroom？Let's count：one，two...thirteen，fourteen，fifteen ，sixteen

（导入 thirteen，fourteen，fifteen，sixteen）

three-thirteen

four-fourteen

five-fifteen

six-sixteen

发现书写规律：后缀teen

（Read in groups，T says：three，S s say：thirteen全部读，个别读）

5.16+1=17 17+1=18 18+1=19（导入 senventeen，eithteen，nineteen）[明1]

6.Game：

①（算一算）15+1 13+5 18+1 12+4 9+8

②数一数狗有多少只腿

T:There are lots of animals in the world，Most animals have legs now，one dog has four legs，two dogs have eight legs

Eg：T:two dogs，S:eight legs

T:three dogs S：twelve legs

Step3 Dills&practice

1.Show students the PPT，use "there are/is"to describe the pictures[明2]

2.show the crayons：how many crayons are there？let's count（lead in crayon）

show studens the PPT: There are only nineteen crayons，but there are twenty children in the class（此处板书）

Step4 Learn the text

① Watch the cartoon with questions:

Q1：What did Ms Smart buy yesterday？

Q2：How many crayons did Ms Smart buy yesterday？

Q3：How many children are there in the classroom？

Q4：Did Ms Smart lose a crayon？

② Watch again and repeat two times

③Role play next class.

课件展示数学算式的结果单不同的是用英语单词得出结果。

课件展示动物，并以倍数出现让学生脑中快速闪现十几的英文表达法。