1, take out the addition board and ruler for children to observe, and talk about its characteristics, dividends in the area and blue ruler.

2. The blue ruler is placed on the upper left of the adding board, and the order is from 9 to 1.

3. Set the red ruler in the order from 9 to 1 and aim at the middle red line on the adding board.

4. Take a blue ruler "1" and put it in the first square of the first row of the adding board. Then count to 10 with the space behind the index finger of the right hand and get the conclusion "9". Then the sum of 1 and "9" is 10. Take the red ruler 9 and put it after "1", then count from 1- 10, and then move the chessboard down one line.

5. Take blue ruler "2" and red ruler "8" to synthesize 10. And so on.

6. Parents can also practice giving their children questions orally or by writing homework sheets, or practice the synthesis of numbers within 10 in this way.

One of Montessori's mathematics series teaching AIDS-subtraction board.

First, the composition of teaching AIDS:

It is painted with a chessboard consisting of horizontal 18 squares and vertical 12 squares, and the number 1- 18 is printed on it. 1-9 is blue, 10- 18 is red, and the positions of 9 are separated by 1 blue straight lines.

Gauge: A, 9 red, 9 blue 1-9 slats, and the red gauge is graduated.

Ruler; B, 17 wooden ruler in natural color with no numbers and scales on it.

Second, the purpose of teaching AIDS:

Exercise 1- 18 subtraction.