There are four in a set. For details, please refer to the illustration!

Teacher: "Now I'll teach the children how to hold a cylinder." " (The teacher demonstrates while explaining.
Hold the cylinder with your thumb, middle finger and index finger
② Start lifting the cylinder from the thicker one
③ Gently lift it up vertically and slowly lower it down vertically
④ The cylinders are lifted and scattered on the carpet
(8) Turn the cylinder upside down with the bottom facing up. Use your left index and middle fingers to touch the side of the cylinder, the bottom, the inner side of the hole and the outer edge, and then insert them one by one into the corresponding circular holes.
(9) The teacher asked the children to operate. The teacher said, "Would you like to have a try?"
(10) Teachers should pay attention to the entire operation process of the children. If there are any improper operations by the children, after the children have operated, teachers can operate again and ask the children to observe before asking them to practice.
After the children have completed the entire operation process, the teacher arranges the teaching AIDS neatly.
(12) The teacher asks the children to answer by using the three-part name practice method.
Teacher: "This is the cylinder of the socket."
Teacher: "Which one is the socket cylinder?"
Teacher: "What's this?"
After the practice, the teacher asked the children to hold the socket cylinder in the correct way and return it to its original place in the teaching aid cabinet.
(14) Then ask the children to roll up the blanket and return it to its original place in the correct way.
Teaching sequence: From simple to difficult, proceed in the order of B-C-D-A.
4. Error Correction
Visually correct that a cylindrical socket is only placed in one corresponding round hole
5. Extended suggestions:
(1) Pairing practice
① Practice finding round holes with a cylinder. Compare the bottom surface of the cylinder with the round holes and embed the same cylinder.
Starting from one end, find the cylinders that match the round holes in sequence. Remind the children that when pairing, they should touch the bottom surface around the cylinder and the inner side of the circle cavity with their fingers first, and then place the cylinder in. (Figure 2
Ask the children to bring the rolled blanket and lay it out.
Teacher b: Today, the teacher brought the children to play a game of finding a home with a cylinder. Each cylinder has its own home. Shall we invite the cylinders to come out and play?
Teacher c asked the children to take out the cylinders one by one in the correct way and scatter them on the rolling blanket.
Teacher d can describe a story plot by himself: The cylinders were playing games together. When they got tired and wanted to go home, they couldn't find their own home. They asked the children to help them find their home.
According to the requirements prompted by the teacher, the children put the cylinders back into the round holes one by one. (If the children make incorrect moves during the operation, the teacher should correct them after they finish.)
f operates in the order of ABCD.
② Put on the eye mask and complete the pairing of the cylinder with the round hole
Teacher a: "Now, the teacher wants to see if the children are capable. Just now, we were looking for a home for the cylinder with our eyes wide open." Now I'm asking the kids to put on eye masks and find a home for the cylinder. Can you give it a try?"
Teacher b asks the children to operate. When the children have difficulty operating, the teacher can give verbal prompts.
c operates in the order of ABCD.
③ Cylinder combination operation: (This exercise can only be carried out after all four groups have been completed.)
Teacher: "Let me play another game with you. I'll ask the children to take out two sets of socket cylinders, put them together, and then see who can get them back to their own homes quickly and accurately, okay?"
Carry out respectively:
Two groups of combined operations: B+C, B+D, C+D, C+A
Three groups of combined operations: B+C+D, C+D+A, A+B+C, A+B+D
Four groups of combined operations: A+B+C+D
④ Exercises accompanied by memory: (This game is played in groups) The teacher first selects a cylinder and gives each child one of the others. They practice distinguishing them in two ways: visual memory and touch memory.
a Visual memory
Teacher: "Children, listen carefully. Each of us has a cylinder in our hands. Now, please put the cylinders back into the cave one by one in the order from thick to thin. Please do it carefully." Children and teachers operate groups B, C, D and A together.
b Touch Memory
Teacher: Please close your eyes, children. Put the cylinders in your hands back into the cave and see who can do it!
(Prompt the children to touch the bottom surface of the cylinder and the inner side of the cave with their hands to distinguish them.)
(2) Sequence Exercises:
① Complete any group of cylinders in the order of "large", "thick", and "high", arranging them in the order of thickness - size - height.
② The exercise of drawing one cylinder from the arranged sequence and asking the child to find its original position, and then drawing the head, middle and tail cylinders respectively.
③ Put on the eye mask and operate to distinguish the arrangement of height, size and thickness.