1. Feel different lengths of rope and learn how to compare rope lengths.

2. Learn to determine the length of the route with the help of the grid diagram.

3. Be able to explore ways to solve problems through careful observation and thinking.

Focus of activities

Learn how to compare the lengths of ropes.

Activity difficulty

Learn to determine the length of the route with the help of the grid diagram.

Activities to be prepared

1. Two sets of ropes (see P26, Appendix 1 and Appendix 2).

2. Operating data: 19 pages of "Who is better than who" and 20 pages of "Far and Near" operating data and marks.

Activity process

First, compare the lengths of objects.

1. The teacher shows the first group of two interlaced ropes to guide the children to observe.

Teacher: The little monkey has two ropes. He wants to weave a big net bag with that long rope, but now he can't tell which rope is long and which one is short. Do you have any good ideas?

2. Teachers ask individual children to come up and operate, collectively verify whether it is correct, and guide children to find that when comparing the length of the rope, one end should be aligned and compared.

Teacher: You try. How do you compare?

The teacher concluded: when comparing the lengths, put the two ropes flat, and then align one end to see which one is longer at the other end.

3. The teacher shows the two knotted ropes in the second group and guides the children to compare.

Teacher: Here are two ropes. Can you tell which is longer and which is shorter? Why?

4. The teacher will loosen the knotted rope and compare it to verify the child's judgment.

Division; Is there any way to compare the lengths of two ropes? The children tried to find a way.

Teacher: Then let's loosen the rope and have a look. Let's lay it flat and align it. Which is longer?

5. Guide children to discover that when comparing the length of the rope, we should also pay attention to the bending degree of the rope.

Teacher: So the rope is as long as it looks? We also need to see if the rope is bent. The more you bend, the longer you get.

Second, children's operation

1. Group 1, Group 2, Group 3: Who is longer?

Teacher: Who's in the picture? Who has the longest tail, the longest ribbon and the longest nose? Please put an appropriate mark next to the corresponding long and short lines.

2. Group 4, Group 5 and Group 6: Who gets the biscuits first.

Teacher: Three mice ate cookies. Which mouse walks the shortest way and which mouse walks the farthest? Please draw a circle on the correct mark.

Three. Activity evaluation

1. Show children's operation data and verify them collectively.

2. Teachers praise children who can actively explore and solve problems in activities.

Activity expansion:

1. The math area can provide cylindrical building blocks with different thicknesses and ropes with different lengths, so that children can wind the ropes around the building blocks themselves and compare the turns, thus experiencing the influence of the building block thickness on the turns of the ropes.

2. In daily life, various materials can be used to guide children to compare, such as comparing the size of bowls, the length of pants, the height of chairs, etc.