Grade 3 math, how to memorize multiplication formulas

As a person who has come over, for the future study of mathematics, the multiplication formula should become a "conditioned" response, that is, it should be trained into "muscle" memory rather than "brain" memory. So memorize the multiplication formula table with an oral vocalization.

<> multiplication formula is learned in the second grade of primary school, starting from "one by one to get one" and ending with "ninety-nine eighty-one", also known as ninety-nine tables, ninety-nine songs, nine-cause songs, and ninety-nine multiplication tables; The ninety-nine table has a history of 2,000 years and is the basic rule of multiplication and division and square operation in ancient China.

Summary of Mathematics Knowledge for Primary 1 to 6 Grades:

Primary 1: 99 multiplication formula, learn the basics of addition, subtraction and multiplication: memorize the 99 multiplication formula, so that you are familiar with the multiplication of single digits;

Primary 2: Improve the multiplication formula, strengthen the knowledge of the first grade, learn to divide the mixed operation, and basic geometric figures;

Primary 3: Learn the commutative law of multiplication, geometric area, circumference, etc., the amount of time and units. distance calculation, distributive property, fractional decimals;

Primary 4: Line angles, natural numbers, integers, prime factors, trapezoidal symmetry, fractional decimal calculation;

Primary 5: Multiplication and division of fractions, algebraic equations and averages, comparative size transformations, graph area volumes;

Primary 6: Proportional Percentage Probability, Fan Cylinder and Cone.

Grade 1Multiplication formulasWhat is it:

The ninety-nine multiplication table was learned in the first semester of the second year.

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 ancient multiplication formula is from top to bottom, starting from "ninety-nine eighty-one" to "one by one", which is contrary to the order of use, so the ancients used the two words "ninety-nine" at the beginning of the multiplication formula as the name of this formula, also known as ninety-nine table, ninety-nine song, nine-nine song, ninety-nine multiplication table.

Multiplication is a shortcut to add up the same numbers.

The result is called the product, and "x" is the multiplier sign. From a philosophical point of view, multiplication is the result of a qualitative change caused by the quantitative change of addition. The multiplication of integers (including negative numbers), vertical rational numbers (fractions), and real numbers is defined by the systematic generalization of this basic definition.

Multiplication can also be thought of as calculating objects arranged in a rectangle (integer) or finding the area of a rectangle whose side length is given. The area of the rectangle does not depend on which side is measured first, which illustrates the commutative properties. The result of the two measurements is a new type of measurement, for example, multiplying the lengths of both sides of a rectangle to give its area, which is the subject of dimensional analysis.

The ninety-nine multiplication table is a systematic collation of the multiplication formulas that children have learned, and there are many rules hidden in the table, some of which are exposed to in class, and some are brand new, but there is one thing that remains the same, and children need to discover it themselves.

After the children observed on their own, they found a lot of patterns. Horizontally, the first number gradually increases, and the second number remains unchanged; The first few lines are the multiplication formulas of several (when it comes to this, I didn't let the child say it, because I think the point has been said, I'm afraid it's too late, so I said that the rules of each multiplication formula we've already talked about, so I won't say it, I feel that the handling is not good, and the children should be asked to recall their rules); Vertically, the first number in the first column is 1, the second number gradually increases, and the number gradually increases by 1, and then the second column and the third column (I then guide the child to summarize the first number in the first column of formulas is the number, and the number gradually increases); Looking from left to right, the mantra gradually decreases by 1; There are a few sentences of the formula, and the product of the last sentence of the formula is a few (it is true, but I don't understand why, although this finding does not seem to help children memorize the formula, but it is a law to have to multiply); Diagonally, the first two numbers of the first line of mantra are the same; The second number of the mantra before the second line is the first number of the mantra in the next sentence, and the first two numbers of the mantra after the third line are 1 larger than the first two numbers of the mantra in the previous sentence, and the following ones also have this law (in fact, the second line is also like this rule, but it happens to be like Solitaire). Look around, although I have been in contact before, but only very good children remember how to see, under my prompting, look at know how to see, and also found a mantra that is related to a few.

The child is really amazing, found a lot of rules, but because there are too many children who want to speak, looking at their anxious look, I can't help but invite him, in the end there is more time to say, less time to memorize, they found so many rules, but they are not used to memorize the formula, I think I didn't deal with it well. However, there are children in our class who are diagonally backed, which I think is quite remarkable, because some children remember it along the back, and they can't be smoked casually, but I found that they all remember it diagonally.

The child's vision is always so unique, and I admire it!

There is a diligent path in the book mountain, and there is no end to the hard work of learning the sea. The quick way to memorize multiplication formulas is to read more, memorize more, and memorize more.