Second grade math multiples, how to explain second grade multiples?

When we were studying, this kind of problem must be done: 3x5=15, because Xiaohong is 5 times as much as me, that is, there are 5 3s, according to the meaning of multiplication, we must use 3x5=15, that is, the number should be placed behind. Now we are using a new textbook that focuses on students' problem-solving skills and is no longer limited to these word games, so whether it is 3x5 = 15 or 5x3 = 15, it is correct.

This question cannot be in the order of the question, it depends on the meaning of the question: 3*5 means the addition of 3 5s, and 5*3 means the addition of 5 3s. Both are fine, because 3*5 and 5*3 are rotational symmetry, in other words, 3*5 can be written as 5*3 using the multiplicative commutative property, and vice versa.

But if you want to be more serious, you have to choose 5*3. If you want to have a columnar formula, it is best to use 5*3=15.

If you have any questions, you can ask me: Star Handsome Guy No. 5, a student in the science experimental class of the High School Affiliated to Northeast Normal University.

It should be 3*5, depending on what the final unit is, the unit is one, that is, 3 is in front; 5 is a multiple, and it is not possible in the front.

15 pcs. One is 3 times 5 and one is 5 times 3.

I think it's 3x5=15, and the general multiple is last!

It is better to be 3x5=15, because writing 5x3=15 in the fourth grade will deduct points.

I think your son's teacher is right. Both calculations are fine. But to be exact, it's 3 5 = 15 in the order of the questions

An integer can be divisible by another integer, and that integer is a multiple of another integer. For example, 15 is divisible by 3 or 5, so 15 is a multiple of 3 and a multiple of 5.

The quotient obtained by dividing one number by another. For example, a b = c, that is, a is a multiple of b. If a number is divisible by its product, then this number is the factor, and its product is a multiple.

Then give a simple example to make it easier for children to understand, for example, Xiao Ming gave me one apple, but gave Xiao Hong 2, then Xiao Hong got twice as many apples as me.

Multiples of partial numbers:

Multiples of 2

At the end of a number is an even number (0,2,4,6,8), and this number is a multiple of 2.

For example, the end of 6 is a multiple of 2. 3776÷2=1888

Multiples of 3

The sum of the single digits of a number is a multiple of 3, and this number is a multiple of 3.

4926。(4+9+2+6) 3=7, which is a multiple of 3. 4926÷3=1642

Multiples of 4

The last two digits of a number are multiples of 4, and this number is a multiple of 4.

is a multiple of 4. 2356÷4=589

Multiples of 5

If a number ends with 0 or 5, this number is a multiple of 5.

at the end of .

Multiples of 2 are learned in the fifth grade. The main thing to learn is multiples of 2, 3, 5. It also expands multiples of 9.

Multiples of two are characterized by 0,2,4,6,8 at the end. The multiple of three feature is that the sum of the digits on each digit is a multiple of three. Multiples of five end with 0 or 5.

It is a major teaching difficulty, and such questions are usually asked in the final exam.

Features:

Write three such numbers at random: 4264 9116 36460, so how to tell if these three numbers are multiples of 2? According to the definition of multiples we learned earlier:

When two non-zero natural numbers are divided and the result is an integer with no remainder, we say that the dividend is a multiple of the quotient and the divisor.

We divide each of these three numbers by 2, and if the result is an integer with no remainder, then these three numbers are multiples of 2. After experimentation, we found that all three numbers are multiples of 2, so this proves that our previous conjecture is correct, so we can conclude that the number in the single digit is 0 2 4 6 8 and the non-0 natural number is a multiple of 2.

1. (1) The circle is 2 times the number of triangles, draw the number of circles: 2) The triangle is 2 times the number of circles, draw the number of circles:

3) The circle is half of the triangle, draw the number of circles:

2. What is 4 times (1)8?

2) How many times is 8 a 4?

3) How much is the sum of 4 5s?

4) How much do 4 and 5 add up?

5) What is the multiplication of 4 and 5?

6) There are ( ) 6s in 18, 3, ( 3 times is 18; A ( ) times of 3 is 12.

6 times is ( ) and the equation is ( ).

3 can be said to be ( ) times of ( ); 3 times of 7 can be said to be ( ) ( ) 6, my mother bought 9 kilograms of apples, and the pears she bought were 3 times that of apples, how many kilograms of pears did my mother buy?

7. My mother bought 9 kilograms of apples, and the apples she bought were pears. 3 times, how many kilograms of pears did mom buy?

8. Xiaohong has 5 apples, Xiao Ming's number of apples is 3 times that of Xiaohong, how many apples does Xiao Ming have?

9. The breeding group raised 72 hens and 9 roosters. The number of ducks is 6 times that of a rooster, how many ducks are there?

10. The students made 30 red flowers and 6 yellow flowers. How many times the number of red flowers is that of yellow flowers?

Summary. 6 times 7 equals 42

6 times 7 equals 42

That's the addition of 7 sixes.

We can memorize Xiao Jiujiu, and it will be easier to do this.