1 times 18, 2 times 9 and 3 times 6 are all equal to 18. Multiplication is a shortcut to add up the same numbers. The result of its operation is called product, and x is the multiplication sign. From the philosophical point of view, multiplication is the result of qualitative change caused by additive quantity. Integers include negative numbers, and the multiplication of rational numbers, fractions and real numbers is defined by this basic definition.

Methods of learning arithmetic

1, mathematics requires skilled calculation ability, so there should be enough exercises after class, and only by doing exercises can you have calculation ability.

2. Do a good preview before class, so that we can better digest and absorb the unknown knowledge points in math class.

3, the mathematical formula must be memorized, and it must be deduced and can be deduced.

4. Mathematics focuses on understanding. When you begin to learn knowledge, you must understand it. So listen carefully in class and see how the teacher explains it.

5. 80% of the scores in mathematics come from the basic knowledge, and 20% of the scores are difficult, so it is not difficult to test 120.

6. Mathematics needs to be done by heart. It is difficult for impetuous people to learn math well. Doing the problem in a down-to-earth manner is the last word.

7. Draw inferences from others and draw inferences from others to cultivate the breadth and depth of mathematical thinking. To put it simply, it is the vertical and horizontal connection between training knowledge, multiple solutions to one problem and multiple solutions to one problem, which lays the foundation for establishing one's own mathematical knowledge system.

8. Plan the time to study math every day. Only when time is guaranteed can we improve our academic performance. Don't be careless, study when you have time, and don't touch when you don't have time. If you don't learn well.