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What should we pay attention to when comparing the numbers of 5 and 4 in primary school mathematics?
The answer is: we can compare the relationship between 4 and 5, and know that 4 is smaller than 5 1 and 5 is larger than 41; Review the relationship between two adjacent numbers within 5.

2. You can use "add" and "delete" methods to make two or three groups of projects different.

Activity preparation: digital cards, magnetic stickers, small pieces, bottom plates for placing small pieces, etc.

Activity process

First, introduce the theme of "Animal Kindergarten Games" to stimulate children's interest.

Second, compare the relationship between 4 and 5.

1. With the theme of "Hens Lay Eggs", combined with PPT, 4 white hens and 5 flower hens are displayed respectively. Q: How many people are there? How many digits can it represent? What else can 4 and 5 stand for?

2. Guide the children to discuss, who is more 4 or 5? How much more? Who is less than 4 and 5? How much is missing? 4 is smaller than 5 1, and 5 is larger than 4 1.

3. Summary: Compared with 5, 4 is smaller than 5 1 and 5 is larger than 4 1.

Thirdly, two or three groups of animals can be changed according to the requirements of more 1 or less 1 by "adding" and "deleting".

1. There are several ways to make two groups (4 animals and 5 animals) equal by adding and deleting.

2. Three groups of animals with different numbers can achieve the same number through addition and subtraction: the middle row is still, how to make the animals with less 1 in the upper row become as many as the animals with more 1 in the lower row?

3. Three groups of animals with the same number can be changed into different groups through addition and subtraction: the middle row is motionless, how to make the upper row less 1, and the lower row more 1.

Fourth, perceive the relationship between two adjacent numbers within 5.