Teaching process:

First of all, interesting animation and wonderful introduction.

1, lead: What song did you just hear, little friend? This is a very interesting cartoon. Big-headed son and small-headed father live happily together like a pair of good friends. What happened between them today?

2, courseware demonstration animation. The process of big head son going to the store to buy milk. )

Mom: Big head son, there is no milk at home. Go downstairs and buy two boxes.

Er: Buy milk, no problem. Let's leave now.

(coming to the store)

Er: Aunt, I'm going to buy two boxes of milk.

Auntie: Sorry, kid, there aren't two whole boxes. There's only so much left.

Son: Huh? There are 9 bottles of milk in this box, and there are only 5 bottles left in this box.

Design intention: Introduce animation into the classroom to stimulate students' interest in learning, and reasonable plot arrangement makes students feel cordial and natural. )

Second, independent exploration and new knowledge.

1, Teacher: Look at the milk, can you ask the math problem of addition calculation?

Health: There are five bottles left in a box and nine bottles left in a box. How many bottles of milk are left in the shop?

Teacher: Can you list the formulas?

Health: 9+5= 14

Teacher: Is that right? How do you know it is equal to 14? Please use the milk picture in your hand to say it.

2, health report (to use the teacher's bottle in front of the demonstration and said)

(1) Student: Press the number, 9, 10,1,12, 13, 14.

(2) Health: Take a bottle (a box of 5 bottles) from here and put it in this box. Add 9 bottles to this box, and it becomes 10 bottles. Add it to the remaining four bottles, which is equal to 14. (Teacher's blackboard writing: 9+5= 14)

(3) Hygiene: Take 5 bottles out of 9 bottle boxes and put them into 5 bottle boxes. 10 bottle plus the remaining 4 bottles is 14. (Teacher's blackboard writing: 9+5= 14)

3. Teacher: Do you have any different ideas?

4. Summary: When we calculate 9+5, we can count down one by one; You can also take a 1 from 5 and add it to 9 to get 10, and then use 10+4 to equal14; You can also take a 5 from 9 and add it up to 10, 10+4= 14.

(Design intention: Let students start to put a pendulum and think, get the calculation method, and cultivate students' ability to solve problems independently; According to students' own characteristics, choose the method that suits them and encourage the diversification of algorithms. )

5, put a pendulum and calculate.

(1) shows 9+3.

Teacher: Please use your favorite method to calculate. You can combine sticks and talk while swinging.

The number and algorithm of health reports.

(2) Display 7+99+4

Teacher: Can you calculate these two questions? Please do the math yourself. Children in trouble can also help with their sticks.

(After you finish, talk to your deskmate about the algorithm. )