1. Learn to understand the quantitative relationship and problem-solving methods of application problems that are several times a number, and answer them correctly.
2. Cultivate students' initial logical thinking ability such as analysis and reasoning.
Teaching focus:
Combining with practical problems, we can understand the meaning of "multiple" and find out a calculation method of how many times a number is, so that we can solve related practical problems.
Teaching preparation:
Stick, scene map
Teaching process:
I. Import business
1, swing it.
There are two sticks in the first row, and the number of sticks in the second row is three times that in the first row. How many sticks are there in the second row? what do you think?
Let the students pose first, and then let them say: There are () () roots in the second row, and there are () roots in the second row. How did you work it out?
2. Draw a picture.
Students independently complete the exercise on page 10. Ask the students to say that there are () () pictures on the CD, and draw a total of (). How to calculate it?
Second, explore independently and impart new knowledge.
1, show the scene diagram.
(1) Dialogue: Look at this picture, what do you want to know? Students may say: How many pine trees are there? How many cypresses are there? ......)
(2) How many pine trees are needed? What can you think of? Draw a picture first.
According to the meaning of the question, the teacher and students draw together.
white poplar
yearn for
(3) How many pine trees are needed? What are you going to do? what do you think?
(4) Students calculate independently.
(5) Conversation: Who will tell you what you think?
(6) Summary: How many pine trees are needed is how many three pine trees are needed, and it is calculated by multiplication.
(7) How many cypresses do you need? How do you plan to calculate? Why? Students talk about the thinking process after independent calculation.
2. practice.
(1) Students practice independently.
(2) What were you thinking when you were revising collectively? (How many white rabbits are needed?). )