Middle school refers to the third and fourth grades of primary school. The following is the introduction of primary school teaching AIDS 1-6:
A, cylinder and cone volume change teaching aid
1, take out plasticine, knead it into a cylinder and then knead it into a cone. This change process is that plasticine changes from cylinder to cone. In the process of making it, no plasticine is wasted. It lives in a cone, and its shape changes, but its volume remains unchanged.
2. Knead plasticine into other shapes. In the process of change, the shape still changes, and the volume does not change.
Second, round teaching AIDS
1, make a circle from a piece of wood and divide it into 15 equal parts along the radius of the circle.
2. Take out one of the equal parts of 15 and divide it into two parts along the radius of the circle. There will be 14 whole parts and 2 half parts.
3. Take out two pieces of cloth, stick seven whole pieces together along the circumference respectively, and then stick 1 half piece. Repeat the above operation for another piece of cloth. Then cut the rest of the cloth.
Third, triangular teaching AIDS.
1. Prepare 3 boards, the length of which can be determined by yourself.
2. Find two equal-length boards to make two waists of a triangle and glue the two boards together. However, the angle of the two bonded boards should be sawed at 45 degrees, so that the two boards are bonded at 90 degrees.
3. Glue both sides of the remaining board to the bottom of the upper two boards respectively.
It is simple to be a teaching aid for primary school students, but teachers take great pains.