The teaching aid consists of five boxes: a triangular rectangular box 1, a rectangular box 2, a triangular box, a large hexagonal box and a small hexagonal box.

The purpose of the teaching aid:

1, cultivate children's keen observation and concentration.

2. Develop the control ability of muscle movement.

3. Enhance hand-eye coordination.

4. Cultivate children's logical thinking ability.

5. Lay a foundation for math learning.

The operation method is as follows:

Rectangular frame 1:

Spread a work blanket and invite children to participate in the construction of the first box of triangle-a rectangular box.

After finishing the teaching aid, take out the triangles in the box one by one and put them on the carpet.

Say "Please separate them according to the shape of triangles" to children, and put them in the order of one or two yellow isosceles right triangles, two green isosceles right triangles, two yellow right triangles, two yellow right triangles, 1 red right triangle, 1 red obtuse isosceles triangle.

Take off the first pair of triangles, put your fingers together, and build the triangles into other figures according to the indicator lines.

Let the children have a try.

The teaching AIDS are all in place.

Rectangular box 2:

The operation method is the same as above.

The sorting order is blue isosceles right triangle, blue right triangle, blue equilateral triangle and blue obtuse isosceles triangle.

Triangular box:

The operation method is the same as above.

The sorting order is 1 gray triangle, 2 green triangles, 3 yellow triangles and 4 red triangles.

Four combined triangles can be reconstructed into a big triangle.

Large hexagonal box:

The operation method is the same as above.

The sorting order is 1 yellow isosceles triangle, 3 yellow obtuse isosceles triangles (bottom indicator line), 3 yellow obtuse isosceles triangles (waist indicator line), 2 gray obtuse isosceles triangles and 2 red obtuse isosceles triangles.

Small hexagonal box:

The operation method is the same as above.

The sorting order is 6 gray equilateral triangles, 6 red obtuse isosceles triangles, 3 green equilateral triangles, 2 red equilateral triangles, 1 yellow equilateral triangle.

Change the extension: 1. Those figures in life are made up of triangles.

2. Children can construct arbitrary graphics after they are skilled.

3. Tell the child the name of the new figure composed of triangles.

4. After the children are proficient in composition, parents can explain the mathematical relationship between triangles, such as equal division and exchange.

Applicable age: over 3 and a half years old.