moving target
1, according to different pictures, list the corresponding formulas, so as to perceive the quantitative relationship expressed by the addition formula.
2, understand the exchange law, know how to use the exchange law to list another formula.
3. Actively explore mathematical activities and be willing to tell the results of exploration.
Activities to be prepared
1. Teaching aid: a picture of the castle (divided into three layers, each layer has three pictures representing plus 7, covered with paper) and a piece of fruit.
2. Learning tools: one for castle map and one for fruit.
Activity process
First, driving a train: review the composition of 7
Teacher: The king of Castle Kingdom invited us to visit his country. Would you like to? Then let's get on the No.7 bus (show the number 7) and start.
Teacher: Hey, my train leaves at X (1), and yours at X?
Yang: Hey, my train X( 1) leaves, and my train X(6) leaves.
Second, situational awareness-going to the castle: the addition of picture learning 7
1, Teacher: Look, the castle kingdom has arrived. The king said he hid many questions in the castle and wanted to test our children. Let's go to the biggest castle first, shall we?
Teacher: Let's go to the first floor of the castle. There are three paintings on this floor. Who wants to talk?
The king wants to test us. Who can list a formula after reading these three pictures? You can go to the second and third floors after answering.
3, children's operation
Teacher: Then let's all go to a castle to answer questions. Slow can only be answered on the first floor, and fast can go to the second floor and the third floor. Don't forget to write your answer clearly.
4. Summary:
Teacher: What problem did you encounter just now? (Express three pictures in three sentences) What is your answer? (children's column formula) teacher record
Ask the children to observe these formulas. "They have a little secret. Who can find it first? " ? "
Teacher's summary: The numbers of these formulas are all 7 and they are all addition, so these six formulas are all addition formulas of 7.
Teacher: Like 1+6=7 and 6+ 1=7, the numbers are the same, but the numbers are the same, so when we see 1+6=7, we immediately think of 6+ 1=7. We call it the question of friends, and we also see that 2+5 =. see ...
Third, internalized migration-game: buying fruit.
1, Teacher: The King of Castle State praised our cleverness and gave each of us a fruit coupon (show us a fruit coupon). Let's look at the price of fruit first.
The king wants to test us again. He said, 7 yuan only buys two kinds of fruits. What do you want to buy? Why? What else can I buy?
3, children's operation
4. Comment: How many methods do you have? What did you buy?
5. Teacher: What if seven dollars buy three kinds of fruits?
Fourth, the end:
Ok, let's go to the fruit shop to buy it.