Instructional Design of "Understanding Normal Year and Leap Year"

Yanbian 067 Deng Juan

Understand the average year and leap year

Teaching objectives

1, let the students know the knowledge of flat year and leap year, and remember the judgment method of leap year.

2. Cultivate students' abilities of observation, analysis, judgment and reasoning.

3. Cultivate students' ability to connect with real life and solve problems in daily life.

Teaching focus:

Master the method of judging whether a year is a flat year or a leap year.

Teaching difficulties:

Experience allows students to observe and compare the days from 20 15 to February 2020, and find out the arrangement rules of February days in these years.

Teaching preparation:

Onion micro-course, multimedia

First,? Introduction before class

1, Question: Which months are big and which months are small in a year?

2. Please raise your left hand for students born in the big month, and raise your right hand for students born in the small month.

3. Question: Why don't some students raise their hands? When is your birthday?

Second, explore new knowledge.

1. Play the onion micro-lesson "Flat Year and Leap Year" to learn about the flat year and leap year.

(1) Narrator: Learn to compare the data in the table through video.

We know that the months and days of the big moon and the small moon are fixed every year, and there are only February days, sometimes 28 days and sometimes 29 days.

(2) Learn onion micro-lesson, and draw a conclusion: once every four years, the number of days in February is 29 days. On February 28th, this year was a normal year, and on February 29th, this year was a leap year.

Pause the micro-class.

2. Calculate the number of days in a year.

(1) Displays calendars for 20 19 and 2020.

(2) How many days are there on 2019? See whose algorithm is simple.

Method 1: According to the original knowledge, it is directly said that 20 19 has 365 days.

Method 2: 31+28+31+30+31+30+31+30+3/= 365 (.

Method 3:

By month:

Dayue: 3 1×7=2 17 (days)

Abortion: 30×4= 120 (days)

Year: 2 17+ 120+28=365 (days)

(3) Question: Think about it, how many days will there be in 2020, and why?

Blackboard: 365+ 1=366 (days)

(4) Summary: There are 365 days in a normal year and 366 days in a leap year.

3. Then play the micro-lesson video. Judge a normal year and a leap year.

(1) speak. I want to know whether a year is a normal year or a leap year. How to judge? Now teachers can judge whether a year is a flat year or a leap year without looking at the number of days in the whole year or February. Can you believe it?

(2) Students test teachers.

Ask the students to test the teacher with their calendar cards. As long as the students tell the teacher what year this year is, the teacher can quickly judge whether it is a normal year or a leap year.

When the students felt magical but still wanting more, the teacher explained to the students: Here, there are tricks. Do you want to know? Let's take a look together.

(3) Then play the video of onion mathematics micro-lesson.

(4) Observe the statistics in the micro-lesson video.

(5) Question: What did you find? (There is a leap year every 4 years) What is the relationship between leap year and 4?

(6) Group calculation.

(7) communication results.

Question: Are there any remainders in the calculation results of the first and second groups? (no)

In other words, the year of leap year is a multiple of 4. So judging whether a year is a normal year or a leap year depends on whether the number of years in this year is a multiple of 4. Generally speaking, if it is a multiple of 4, this year is a leap year. If it is not a multiple of 4, this year is a normal year.

(8) Read the contents at the bottom of page 79 of the textbook.

(9) Define what is the Gregorian calendar year.

(10) Understand "general" and "necessary".

Question: Groups 3 and 4, 1900÷4, are there any remainders? (No) But it is not a leap year, which is a special case, so the words "general" and "necessary" are used in the book. Usually, when the Gregorian calendar year is an integer hundred, the chronology must be a multiple of 400 to be considered as a leap year.

(1 1) Think about it: Why is there a leap year every four years? Why is it a leap year if the whole hundred years are multiples of 400?

Speak supplementary information.

(12) Show the pictures of famous people and great men such as Hua, Chen Jingrun, and so on, and let the students decide whether it is a normal year or a leap year.

Third, the design of new classroom assignments

How many days are there in normal years 1 and 1? How many weeks and days have it been?

(1) Call the roll first. Answer: 1 How many days are there in a year on average? 1 How many days are there in a week?

(2) Calculate how many weeks and days there are in the average year of 1.

(3) communication results. Tell me about your calculation process.

2. When Xiao Qiang 12 years old, he only had three birthdays.

(1) Question: When was Xiao Qiang born?

(2) answer.

(3) explain the reasons.

3. People's Republic of China (PRC) was founded in 1949, 10, 1. How many weeks are there this year?

(1) Ask questions.

(2) oral answer.

(3) Question: How did you work it out?

4. Zhang Hua turned 10 in May this year. What year was he born? One student's birthday in the group is one day later than the National Day, and another student celebrated his birthday the day before yesterday. Guess when everyone's birthday is.

(1) Group study.

(2) Finish the first question first.

(3) Guess when the birthdays of the two students in the second question are.

(4) According to the clues provided by everyone in the group, guess when their birthdays are.

Fourth, thinking training.

Make the monthly calendar of this year 1 with the table below.

Day one two three four five six

(1) Tell the students when next year is.

(2) Complete the monthly calendar independently or in groups.

(3) show the production results.

Five, the blackboard design

Know the average year and leap year.