9+3+4 8+6+9 3+2+7

10-8-2 13-2-7 19-6-5

Second, continuous teaching.

Show thematic maps and tables.

Group 1, Group 2 and Group 3

28 34 23

Q: What do you see?

What quantity do you see from the table? (three conditions)

What questions can I ask?

The teacher writes the students' questions on the blackboard. Choose: How many did you choose? )

Q: Can you make a statement?

What do we call this formula? (written on the blackboard)

Please calculate on the draft paper! Student board performance

Third, reduce teaching continuously.

1, students look at the pictures and make up the application questions orally.

There are 85 watermelons, 26 in Li Mingyun, 40 in my shipment, how many are left?

Parallel playback

Fourth, consolidate practice.

Oral calculation: 7+59+20 72-6-40

Written calculation: 46+25+1775-28 = 54+20+1690-58-24 =

Teaching reflection:

Practice class

Teaching content: practice of addition and subtraction and addition and subtraction.

Teaching purpose:

Strengthen the addition and subtraction operations and mixed addition and subtraction operations that students have learned, and improve the calculation speed and accuracy of students.

Teaching emphases and difficulties:

Improve students' computing ability

1, the following questions are calculated orally.

55+30+8 39-4-32 37- 10+5

56-3+9 8 1-7-70 74+6-80

The teacher reads the questions, and the students answer them in the form of rushing answers.

2、 +8 -20

39 ( ) ( )

56 ( ) ( )

18 ( ) ( )

Students calculate in the draft book, write the names on the blackboard, and revise collectively.

3、 +36 -47 +58 -23

25 ( ) ( ) ( ) ( )

4. Write down the following questions.

69+30-45 65+ 18-39

26+40-8 7 1-65+45

5、

245 1 15

2 13039

49936

Calculate the sum of three numbers in each horizontal line, vertical line and diagonal line.

Xiaoming has to practice 75 words, and he has 37 words left. How many words did he write?

7. Which number is the outer circle minus which number is the inner circle, and the number is 62?