Lesson plans for children within 20 years

Teaching content: pages 43 and 44 of the mental arithmetic book. Teaching Requirements:

1. Master the method of direct addition and direct subtraction within 20.

2. Stimulate children's interest in participating in mental arithmetic activities and experience the joy of success. Teaching Aids: Disc Diagram, Courseware Teaching Process:

1. Basic training 1. Move your fingers.

The left and right hands pluck the beads 1-20 at the same time

2. Listen to the abacus (pluck the beads with both hands at the same time) 3. Look at mental arithmetic.

4. Summarize and reveal the topic 2. New grant 1. Show the diagram.

Can you look at the diagram and name the four equations? 2. Explain 10+5

1) How much to dial in first, and how much to dial in again?

2) How to dial 10? Why dial 1 on the 10th digit? (3) How to dial 5? Why dial 5 in the single digit? (4) Who will dial, give it a try? (5) Qi dial. (6) Empty dial 3, explain 5+10

4. Compare 10+5 and 5+10

What similarities and differences do you find when dialing beads? What should I pay attention to when dialing beads?

Summary: For direct addition within 20, students should find the right number when dialing the beads, and see how many plus few. 5. Explain 15-10 and 15-5

Summary: For direct reduction within 20, students should find the right number when dialing the beads, and see a few minus. 6. Try 11+3 19-6 20-10 18-16

7. Summary of the new award: direct addition and direct subtraction within 20, find the right number, and see a few dials.

3. Finger exercises 4. Exercises. 1. Actual allocation.

15+1 7+12 16-5 17-12 11+8 19-13 18-6 5+14 2.

1) 10+0 10+7 10+8 10+5 10+3 10+4 (2)15+1 7+12 16-5 17-12 11+8 19-13 18-6 5+14 3.

15+1 7+12 16-5 17-12 11+8 19-13 18-6 5+14 4. Listen to abacus (5 strokes, remember to count) 13-3+8+1-5 5+3-7+1+15 3+11-10+5-4 8-3+10+1-5 12-1+5-6+7 7+1-5+11-2 2+15-7-10+9 12-1+5-10+3

A case is a description of a real-world situation, including one or more difficult problems, and can also contain solutions to those problems; Teaching cases describe teaching practices, which show people some stories that include typical behaviors, thoughts, and emotions of teachers and students in the form of rich narratives; An educational case is a story in an educational situation, and people often express their own opinions, that is, comments, while narrating a story. So a good case is a vivid story with great reviews.

1. Use your fingers well and let the baby stretch out his little fat hand to calculate the addition and subtraction.

2. Use candy or the baby's favorite snacks to add or subtract, and if you get it right, you will be rewarded with one!

3. Every time you go to the supermarket, let the baby choose a piece of less than 20 yuan, and let him (her) pay the money by himself. The little ones will work their own.