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Hello to all students.

Today we will Let's study mathematics at the elementary level. For the subject that we will study, we will You will study in Chapter 1: Numbers and Operations, which has 2 topics. Chapter 1: Read and write numbers instead. Number 2 tells the place value and value of numbers.

For part 1, we will study only one subject, which is Reading and writing numbers instead of numbers. First of all, we will study the content. Ah, I'm going to try taking the test before studying at the same time. With the teacher, let all students do it together.

Let's go ahead and take a look at the pre-class test. The teacher's pre-class test has 3 questions for students to try first.

Question 1: Tell the pronunciation of 185.

Question 2: Tell the pronunciation of 6789.

And Question 3: 229. Tell. Which number is the underlined number? And how much is it worth?

Let's try to do it together.

First, tell me the pronunciation of 185. If students see numbers like this, when we look at numbers, we look at them from behind. In front, you look from right to left, right? For example, the number 5 is in the units digit, the number 8 is in the 10s digit, and the number 1 is in the hundreds place. When reading values, we read from left to right. Read from the front to the back, it is 185.

If that's correct, think in your head first. We'll wait.

Let's go look at the answer together for number 2. Tell the reading words for 6789 as well. We see the value of numbers like this and we will look at them. Its last value is the last one, which is the number 9 in the units place, the number 8 in the 10s place, the number 7 in the hundreds place, and the number 6 in the thousands place. When we read, we read from front to back, read 6789.

Answer in your head first. I'll go look at the answer. Simultaneously with question 3, 229, tell the number. In which digit is the underline and what is its value? The underlined number is number 2, right? We see the same number as before. We have to look at it. The last one, right? The number 9 is in the units digit, the number 2 is in the 10s place, the other number 2 is in the hundreds place.

So ask for the one that... Is that an underline? It's in the 10s place. 2 has a value equal to 20. Is that right? We'll go look at the answer together.

Yes, go look at the answer. Do you see it?

Answer number 1: Tell me the pronunciation of 185. It reads 185. That's correct.

Tell me the pronunciation of 6789. It reads 6789. Correct.

For question 3, 229, tell me the number in the line. In which digit is the underline and what is its value? 2 is in the 10s place and has a value of 20. Which one is correct?

Whoever did all 3 questions correctly, just like the teacher, very good.

Now let's get into the content. Let's start with the first lesson. The first thing is to read.

And writing numbers instead of numbers is what describes the quantity of various things. How much? This is the meaning of the word number. A number is a symbol used to represent one or more digits.

There are 10 different symbols used to represent numbers in Hindu-Arabic numerals used in the present, such as 0, 1, 2, 3, 4, 5, 6, 7, 8, 9. It is already said that it is a single number, therefore a single digit.

Sure enough, next, the prime number is the number. A count that is more than 1 that has 2 factors is 1 and itself, such as 2, 3, 5, 7, 11, 13.

Question to think about, students: Why is 10 not a prime number? That's why 10 isn't a prime number. 10 isn't a prime number because 10 is divisible by 2. 10 is divisible by 5. So 10 isn't a prime number.

Yes, what the teacher is going to tell the students is no matter what. It would be a good test before class, as well as content. It's good.

In summary, according to this picture, normally, if we had it in the past, we would use symbols to represent quantities of things. For example, if there is 1 thing, we would write 1 line; if there are 2 things, we would write 2 lines; if there are 3 things, we would write 3 lines; if there are 4 things, we would write 4 lines.

But if there were 100 things, we would have to write 100 lines. So it's in the popularity of society. Nowadays, it is commonly used to write numbers instead of telling the quantity of that item.

In short, numbers speak volumes. The quantity of things is very small. Just how much is that?

The number part is the symbol used to represent a number. The first story is that I hope all students will understand and can read and write numbers instead of numbers.

Yes, for the first story, there is meat. That's all we found.

We'll meet again in the second story.