I hope that the second grade students in primary school will have queue training. There are four people around Xiaogang. How many students will take part in the queue training?
4+4+ 1
=8+ 1
=9 (person)
9x9=8 1 (person)
A: There are 8 1 students participating in the queue training.
analyse
This topic examines the application of integer addition and multiplication.
There are four students around Xiao Ming, that is to say, Xiao Ming is in the center of the square, that is to say, every row and column of this square has: 4+4+ 1=9 (person), so this square is a 9x9 square, so: 9x9=8 1 (person), so this square is a *.
Extended data:
I. Addition and subtraction formulas within 10:
1, 19 19 good friend,?
22828 hand in hand,
3,3737 is really close,
4. Let's go together, four, six, four, six,
5. Fifty-five years old is a pair of hands. ?
Second, the shorthand method of multiplication formula table:
1, let children understand that the first two numbers of the formula are multipliers, and the last number is the result of multiplication of two numbers, which is called product.
2. In the process of memorizing, I gradually feel the relationship between two adjacent formulas.
3, some confusing formulas can be directly listed and compared, so that children can learn to distinguish and their memories will be deeper.
4. Storytelling can be used to teach children, enhance their interest and help them remember.
5. Let children apply what they have learned and do exercises while learning.