First, the teaching objectives

1, combined with the specific situation, explore the strategies and methods of estimating large numbers. We can estimate large numbers in life in different ways with the help of multiplication and cultivate a sense of numbers.

2. In the process of communicating with classmates, you can clearly express your own estimation ideas and specific methods, and cultivate the orderliness of thinking.

3. Feel the application value of multiplication in problem solving activities.

Second, the key points and difficulties

Teaching emphasis: auxiliary multiplication uses different methods to estimate the larger quantity in life and develop the sense of number.

Teaching difficulties: be able to clearly express your own estimation ideas and specific methods, and cultivate the orderliness of thinking.

Third, teaching preparation.

mixed-media

Fourth, the teaching process

(A) reveal the theme and introduce new knowledge

1. Have the students been to the stadium to watch the ball?

2. How many spectators can this stadium hold?

Today we want to know how many viewers there are.

(B) create situations and introduce new knowledge.

1. What can you do to estimate how many spectators this stadium can accommodate?

(1) Count the audience in a row first, then count the rows, and calculate by multiplication.

(2) We can estimate how many spectators there are in a stand first, and then ...

2. Students, look at this shelf on the screen. How many viewers are there?