Data expansion:
Mathematical multiplication, then it can be calculated step by step through the steps of off-type calculation, for example, 3×2×5=6×5=30.
Summarize the two-step calculation method to solve practical problems: find out the intermediate quantity according to the known conditions and determine what to seek first and then what to seek. You can find out the number of each copy first, and then multiply it by the total to get the total; You can also get the total number of copies first, and then multiply each number of copies to get the total.
The practical problems are solved step by step by multiplication. The application of subheading can make everyone more clearly distinguish the relationship between problem-solving ideas and various quantities, which plays a very good role in promoting the formation of problem-solving ideas.
Multiplication is a shortcut to add up the same numbers. The result of its operation is called product, and "X" is the symbol of multiplication. From the philosophical point of view, multiplication is the result of qualitative change caused by additive quantity. The multiplication of integers (including negative numbers), rational numbers (fractions) and real numbers is a systematic summary of this basic definition.
Multiplication can also be seen as calculating the objects arranged in a rectangle (integer) or finding the area of a rectangle with a given side length. The area of the rectangle does not depend on which side is measured first, which shows the exchange property. The product of two measured values is a new type of measurement, for example, multiplying the length of two sides of a rectangle to get its area, which is the theme of size analysis.