Move the , can you use the multiplication equation to find out how many there are?

Hello. Move one of the 4 squares on the left to the middle pile, so that each of the 3 squares has 3 squares.

That's 3 3 = 9

In the operation of numbers, there are four kinds of operations: addition (+), subtraction (-), multiplication ( ) and division ( ), and we are mathematically in order to be able to calculate them more conveniently, referred to as simple calculation, and there are the following kinds of simple calculations (see the product of commonly used special numbers and the simplified calculation formula for details).

Addition: (Commutative Law of Addition) (Associative Law of Addition) (Approximate Number).

Multiplication: (multiplicative commutative law) (multiplicative associative property) (multiplicative distributive property) (multiplicative distributive property variation (four)).

Subtraction: (basic properties of subtraction) (approximate number).

Division: (basic property of division) (invariant property of quotient).

This is one of the most common math calculation problems in elementary school. From the beginning of students' contact with computing, the idea of simple operation is infiltrated from various angles, and in the fourth grade, simple operation is officially presented as an independent question type in the calculation problem, which is the most flexible one of the calculation problems, which can make the flexibility of students' thinking be fully exercised, and will play a very big role in improving students' computing ability. What is simple arithmetic is a very simple question, but in order to understand it correctly, it is absolutely not necessary to perform simple arithmetic for the sake of simple form.

In this regard, my understanding is that simple operation should be flexible, correct and reasonable use of various definitions, theorems, laws, properties, laws, etc., change the original order of operation for calculation, and greatly improve the calculation speed and accuracy through simple operation, so as to make complex calculations simple. That is to say:

The most important thing is to apply various definitions, theorems, laws, properties, and laws flexibly and reasonably. In particular, "flexibility" and "reasonableness" should be emphasized.

The left one moves to the middle to get 3 3 9

Move the box in the upper right corner of the first figure to the upper left corner of the second figure, and then you can form three identical figures, and the result is 3 3 = 9

Move the first block from one to the second to get.

The method of moving is as follows:

3x3=9 (pcs).

A: There are 9 squares in total.

This question examines the practical application of multiplication calculations:

By moving the squares of the first figure, give Figure 2 a square, so that each figure is composed of three small squares, a total of three figures, and the total number of small squares in the figure can be found by multiplication: 3x3=9 (pcs).

The multiplication formula is the basic calculation rules for multiplication, division, square and other operations in ancient Chinese calculations, which have been used for more than 2,000 years.

The multiplication formula table should be pointed out to the child by the same difference, which is a qualitative law that is very easy to grasp, the number of each column, the number of the difference from top to bottom, is exactly the number of columns in the column itself. For example, in column 1, you can +1 from top to bottom, and in column 2, you can +2 from top to bottom. As long as you master the rules, it is easy and labor-saving to memorize.

Let's say: The final number of the first batch is A, and the final number of the second row is B. Then the vertical hill rents a+b=12 and b=2a solves: a=4, b=8. 10-4=6。That is, move the 6 apples from the first row to the second row.

Let's say: The final number of the first batch is A, and the final number of the second row is B. then a+b=12 and b=2a solve: a=4, b=8. 10-4=6。That is, move the 6 apples from the first row to the second row.

If it's multiplied, it's 100!