Draw a rectangle, divide it into cells with corresponding digits multiplied by digits according to the digits of two multipliers, write down the digits of multiplier and multiplicand in turn at the edge of the cell, then divide the cell into two by diagonal, record the ten digits and single digits of the product corresponding to the above digits respectively, add these products from right to left along the diagonal, and move forward when they reach ten.

For example, to calculate the product of 128 multiplied by 456, first draw a rectangle and divide it into 3 times 3 cells, then write down the digits of the multiplier and the multiplicand in turn at the edge of the cell, then divide the cell into two by diagonal, record the ten digits and the single digits of the product corresponding to the above digits respectively, add these products from right to left along the diagonal, and when they add up to ten, move forward to get 65438.

Italian dot matrix multiplication makes the multiplication calculation intuitive and easy to understand by transforming the multiplication into a visual process of filling the dot matrix, which is especially suitable for beginners and manual calculation.

The importance of multiplication in mathematics;

1. Basic operation skills: multiplication is a basic mathematical operation skill and the basis for learning other advanced mathematical concepts. Whether calculating geometric quantities such as area, volume and perimeter, or solving mathematical problems such as equations and inequalities, it is inseparable from the application of multiplication.

2. Problem solving: Multiplication is widely used in daily life and can be used to solve various practical problems. For example, when shopping, calculating the total price of goods needs multiplication, calculating time needs to consider the relationship between speed and time, and calculating work efficiency needs to consider the product of workload and time.

3. Understanding advanced concepts: multiplication is the basis for understanding many advanced mathematical concepts. For example, by understanding the concept of multiplying two numbers to get a product, we can extend more advanced mathematical concepts such as vector and matrix.

4. Mathematical modeling: Multiplication is also widely used in mathematical modeling. For example, the calculation of power in physics and the calculation of total income in economics require multiplication.

5. Computer Science: In computer science, multiplication is also one of the most basic operations. Both binary number multiplication in computer and pixel matrix multiplication in image processing need multiplication.