The teaching aid consists of one hundred boards, a control board, 1- 100 wooden digital boards and 10 small boxes (there are film boxes, each box contains 10 numbers, and the outside of the box should be labeled1-kloc-0/0. 1 1-20,2 1-30…..9 1- 100)

Educational purpose: The direct purpose is to identify the positive sum and the reciprocal within 100.

Indirect purposes: First, introduce interval counting to cultivate children's concentration and patience.

Operation method:

1, prepare the table, invite children to work together, and introduce the work of 100 board.

2. Take the teaching aid, put the 100 board in the middle, the control board on the left side of the 100 board, and the digital board box in the control.

In front of the board.

3. Pour out the digital board from the box marked 1- 10 and spread it out under the 100 board.

4. Point to "1" in the control panel and say "1". Find out 1 from the digital board and put it in the corresponding position of 100 board. Say "1" again.

5. Point to "2" in the control panel and say "2". Find 2 from the number board and put it in the position corresponding to 100. Say "2" again.

6. After1-10 is completed, do11-20 ... 91-kloc-0/00 in the same way.

7. When collecting digital boards, start from the bottom line and put them into the corresponding digital boxes.

8. Return the teaching AIDS. (as shown in figure 14- 1)

Changes and extensions:

1, self-made 0-99 control panel and digital card.

2. Place a number in the grid corresponding to the 100 chessboard at will, and let the children find out the adjacent numbers.

3, design paper practice paper, let children practice writing numbers.

4. Digital solitaire game: Mix the numbers of 1-20, and divide each family member into 4-6 parts. After the start, let the children and their families arrange their digital boards in numerical order on the 100 board.

5. Let the children summarize the odd-even number rule within 100.

Note: This activity can only be carried out when children are familiar with 100.

Applicable age: children over 4 years old.

Error control: control panel.

Note: As there are many digital boards, it is advisable to use 2-3 boxes of digital boards for each exhibition.