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How to make a smart house on page 24 of the math textbook?
The clever hut in the first grade mathematics is to let you count how many people are in the hut. This question is simple.

"Smart House" is an open question, which aims to cultivate students' preliminary reasoning ability. (1) Guide students to observe the vertical posture, from which we can know that the number of two kinds of small animals is constant whether they are in ten or one position. (2) Students do it independently and find out which two numbers add up to 9. (3) Instruct students how to write without repetition or omission.