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Mathematics in Large Classes: Reflections on Hanging Colored Lights
Hanging lanterns is a mathematical arrangement activity, which children have been exposed to since last semester in primary and secondary schools. Arrangement refers to arranging more than two objects according to certain characteristic differences or certain rules. It is a continuous comparison. Based on the comparison of two objects, sorting can promote the development of children's analytical and comparative ability. This activity class is mainly to help children review one-dimensional sorting and learn two-dimensional sorting according to the characteristics of color and quantity.

The goal of this activity is 1. Learn to arrange according to ABA mode and express your own arrangement mode clearly. 2. Find out the arrangement rules in the arrangement objects and arrange them.

At the beginning of the activity, I used the scene to lead in, "The Lantern Festival is here. Mother rabbit bought some lanterns. Let's see how many colors of lanterns Mother Rabbit bought? " How many people are there? Next, in the scene where Brother Rabbit hangs lanterns to decorate the rabbit house, guide the children to discover the secrets of two kinds of lanterns (one is arranged according to the law of red, yellow and red, and the other is arranged according to the law of yellow, red and yellow), help Brother Rabbit continue to hang lanterns, and let the children understand and consolidate their understanding of the characteristics of two-dimensional sorting in the process of trying two-dimensional sorting-sorting by color and quantity.

Next, use the third page of the children's book to let the children complete the operation as required. Children's interest in the whole activity is quite high, but judging from their own operation, they are not optimistic. Most children have not mastered ABA rehearsal rules well.

1. While observing the different methods of hanging lanterns by Brother Rabbit and Brother Rabbit, let the children compare the differences between AB and ABA, and let them compare when they operate by themselves.

2. There is only one set of Aba lanterns demonstration in children's books, which is difficult for middle-class children to find. There should be two or more groups for children to observe and compare easily.

Judging from the children in this activity, we don't have to use the contents of children's books to operate. We can design reasonable operating materials for children to use.