What are the reading and writing questions within 100 million in the fourth grade?

1. Numbers within four digits should be read from the high position in the order of digits.

2. Numbers with more than four digits are graded from right to left, and then from the highest level, read 100 million, 10,000, and individual levels in turn. Read out the numbers in each level and their names.

The number in the 100 million level is read according to the reading method of the number of each level, and then the word "100 million" is added at the end; The number in the 10,000 level is read according to the reading method of the number of each level, and then the word "10,000" is added after it;

3. No matter how many "0s" there are at the end of each level, don't read them; The other digits have a "0" or several "0s", all of which read only one zero.

Four-digit grading method.

In China, it is customary to classify multiple digits according to four digits, that is, from a single digit, every four digits are regarded as a level. one, ten, hundred, thousand, four, called individual level; Ten thousand, one hundred thousand, one million, ten million four, called ten thousand; 100 million, 1 billion, 10 billion, 100 billion, called 100 million. Individual, 10,000, 100 million......It's called a scale.

The reading method within 100 million is to read 10,000 levels first, and then read one level. The number of 10,000 levels should be read according to the reading method of each level, and then the word "10,000" should be added to the end. No matter how many zeros there are at the end of each level, they are not read.

All other digits have a 0 or several zeros in a row, and only one 0 is read. Write 10,000 levels first, and then write 10,000 levels. If there is no unit on any digit, write 0 on that digit.

The reading of numbers above 100 million is similar to the reading of numbers within 100 million. 100 million. The numbers of 10,000 are read according to the number (on each level), and the words (100 million) and (10,000) are added to them.

Here's how to read it:

1. Read out the numbers in turn from left to right according to the horizontal column of the number, such as 3045002 read as 3045002, this reading method is used when reading pure decimal or records, and it is called a short reading, which can be used for decimal and non-decimal readings.

2. From right to left, they are: individual level (including single digit, ten, hundred, thousand), ten thousand level (including ten thousand, one hundred thousand, million, ten million), billion level (including billion, billion, billion, billion

It is customary for China to use the decimal system.

Reading, and uses the four-digit grading rule, i.e. every four counting units from the single digit.

As a level: 1, single, ten, hundred, and thousand are called individual levels;

2. 10,000, 100,000, 10,000, and 10,000,000 are called 10,000 levels;

3. 100 million, billion, 10 billion, and 100 billion are called billions, etc.

Billion is 10 to the 8th power, which is 10,000 and 10,000.

2. Take a piece of paper as an example, 100 million pieces of paper weigh more than a ton. 100 million sheets of paper are 10,000 meters high, taller than Mount Everest.

3. Take the rice that is often eaten as an example. 100 million grains of rice is about a ton, enough for a person to taste from birth to about thirty-five years old.

4. If you drive on the road, you only run 100 kilometers per hour, and you can drive 1000 kilometers for ten hours a day. If it is a 100 million kilometer road, it must run for 100,000 days, which is equivalent to 270 years. If the average life expectancy is 70 years old, it will take four generations to run!

Example: Write the following numbers, 300 million, 390 million, 700000000000000000000000000000000000000000000000000

billion, billion, billion, trillion, trillion, trillion, 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

Qianjian, Zheng, Shizheng, Baizheng, Qianzheng, Zai, Shizai, Baizai, Qianzai, Shiji, Baiji, Qianji, Ganges Sand, Ten Ganges Sand, Baigang Sand, Qiangang Sand, Asangha, Ten Asangha, 100 Asangha, 1000 Asangha, 10000 Asangha, 10000 Asangha, 10000 Asangha, 100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000

Reading of numbers within 100 million: read 10,000 levels first, and then read a level, the number of 10,000 levels should be read according to the reading method of each level, and then add a 10,000 word at the end, no matter how many 0s there are at the end of each level, and other digits have a 0 or several consecutive o's are read as an o.

China is accustomed to using the decimal reading method and adopts the rule of four-digit grading, that is, from the single digit, every four counting units as a level:

1. The single digit, ten digits, hundreds, and thousands of digits are called individual levels.

2. 10,000, 100,000, 10,000, and 10,000,000 are called 10,000 levels;

3. 100 million, billion, 10 billion, and 100 billion are called billions, etc.

On the basis of mastering the counting units of "individual", "ten", "hundred", and "thousand" and correctly reading the numbers within 10,000, expand the counting units to 100 million, and learn to read the numbers within 100 million by level.

100 million, shape and sound words. From people, the voice. The original meaning refers to Ann.

Sayings:"billion, Ann also. "Zuo Chuan: The Twenty-first Year of Zhao Gong":

The heart is happy. "Du pre-note:"billion, Ann also.

and the unit of counting, or said"Thousands of dollars", or said"100,000,000,000,0"。

Teaching Objectives:

1. Know 100 million, 1 billion, 10 billion, 100 billion.

2. Be able to correctly read more than 100 million numbers.

3. By summarizing the reading rules within 100 million, students will develop their ability to analyze problems.

Teaching focus: Organize the number order table and the reading of hundreds of millions of numbers.

Preparation of teaching aids: small blackboard, slides, dials.

Teaching Process: Teaching Content Teaching Time Teacher Activities Student Activities.

Review 5 I. Ask students to name the unit of counting within 10,000.

Second, the projection presented:

100 million ( ) 10 billion is ( ) 10 billion is ( ) 2, what is the rate of advance between each adjacent two counting units?

3. Present the small blackboard: read out the following numbers.

1. Students' oral answers: one, ten, hundred, thousand.

2. A number of students answered:

1. Billion, 10 billion, 100 billion.

2. It's ten. 3. One student reads and the other writes "Read......Poor line grinding".

New grant 10 I. Board Topic: Reading within 100 million.

Q: How much is 900 million plus 100 million? What should I do if the 100 million bit is over 10? (Board book: billion) use the same method to understand tens of billions, quadrillions. ）

Board book: billion, 10 billion, 100 billion.

Point out: 100 million, 1 billion, 10 billion, 100 billion are all counting units.

2. Students will allocate 90 million beads as required.

It's 100 million, and 10 million is 100 million to 100 million.

The students allocated 900 million beads as required.

It's a billion, and the billions are full of ten to one billion.

Students learn about counting units.

How to read numbers within 100 million 10 I. Teaching example 1

1. Ask students to dial 6.1 billion on the dial.

Guide students to read 61 in a level-by-level manner, and then add the word "100 million" at the end.

2. Ask students to dial 1,402,000 on the dial and read the number as they just did.

3. Ask students to read out the numbers in the practice questions in "Do a Do".

4. Summary: What is the difference and connection between the reading of the number on the 100 million level and the number on the individual level?

1. Students allocated 6.1 billion.

Students read 6.1 billion.

2. The student reads 142,000.

3. Students read and correct each other.

4. Induction: Same: 100 million series should be read according to the reading method of individual series.

Different: The word "100 million" should be added after the 100 million series.

100 million sheets of paper are thicker than Mount Everest; 100 million coins weigh 4 times more than 3 adult blue whales; 100 million grains of rice can fill the stomachs of 10,000 people.

1. Let students feel the size of 100 million from different angles, and be able to express their feelings about the size of 100 million with concrete things in combination with reality.

2. Cultivate students' interest in learning mathematics and their ability to solve practical problems, enhance their awareness of active participation and willingness to cooperate in activities, and cultivate the good character of diligence and thrift.

Preparation of teaching aids and learning aids:

The teacher prepares a scale, a tape measure, a stopwatch, 100 meters of rice, and a projection of the object.

Students prepare calculators and exercise books.

1) Group activity, count by hand.

In small groups, each person takes out some exercise books, puts them together, counts them one by one in a circular way, counts to 100 books and tells the teacher, the teacher immediately tells each group the time spent, and the group leader records it. After completion, each group sent a representative to share 100 exercise books with the class, approximately the time it would take.

2) Work in small groups and ask questions.

Conversation: At this rate, how many seconds would it take us to count 100 million exercise books?

Show the ** in the book (students can change 90 seconds and 900 seconds to other seconds agreed by the class) and ask students to work in small groups to make the calculation and fill in the calculation result in **.

The group gives feedback and reads the final number by name.