Wow, this retired teacher in his 90s is really amazing! He actually carefully wrote out a mathematical formula for his grandson that must be learned in elementary school, and all of them are here for 1-6 years, which is really comprehensive! These mathematical formulas include what geometric formulas, unit conversion, sum and difference problems, tree planting problems, quantity relations, and so on, all of them are very clear, and they are really useful!
For example, geometric formulas are relatively basic concepts in mathematics, and it is very important for elementary school students to master some basic geometric formulas. The formulas for the area and perimeter of squares, rectangles, and triangles are listed by the old teachers one by one, so that children can directly apply these formulas when calculating the area and perimeter of the figure, and they don't have to work hard to calculate.
There is also unit conversion, which is also a relatively basic concept in mathematics. The veteran teacher listed the conversion relationships between various units, such as the conversion between meters, centimeters, and millimeters, the conversion between kilograms, grams, and so on. In this way, when the child solves a math problem related to the unit, he can directly use these conversion relationships for calculations.
Let's talk about the sum problem, which is a relatively common problem in mathematics. The old teacher listed the formulas and methods to solve the sum and difference problems, such as the sum and difference of two numbers, the sum and difference of three numbers, and so on. In this way, when the child solves the math problems related to the sum difference, he can directly use these formulas and methods to calculate.
There is also the problem of tree planting, which is also one of the more interesting problems in mathematics. The veteran teacher listed the formulas and methods to solve the problem of tree planting, such as planting trees at equal distances in a straight line, planting trees at equal angles in a circle, and so on. In this way, children can directly use these formulas and methods to calculate when solving math problems related to tree planting.
Finally, there is the quantitative relation, which is a relatively abstract concept in mathematics. The old teacher lists the relationships between various quantities, such as proportional relations, inverse proportional relationships, and so on. In this way, children can directly use these relationships for understanding and analysis when solving mathematical problems related to quantities.
Let's give an example of how these formulas and methods are applied. For example, there is a question: "The length of a rectangle is 10 centimeters, the width is 5 centimeters, find the area and perimeter of this rectangle." "If the child masters the formula for calculating the area and perimeter of the rectangle, he can directly calculate that the area of the rectangle is 50 square centimeters and the circumference is 30 centimeters.
Another example is the question: "The side length of a square is 8 meters, find the area and perimeter of the square." "If the child masters the formula for calculating the area and perimeter of the square, he can directly calculate that the area of the square is 64 square meters and the circumference is 32 meters.
There is also a question: "There is a series of equal differences, the first term is 2, and the tolerance is 1, find the sum of terms 5 and 6 of this equal difference series." "If the child has mastered the general formula and summation formula of the equal difference series, he can directly calculate that the 5th term of the equal difference series is 6, the 6th term is 7, and the sum of them is 13.
Through these examples, it can be seen that mastering these mathematical formulas and methods is very important for elementary school students. These formulas and methods can help them better understand and solve various mathematical problems. Moreover, these formulas and methods are very basic and important, which are of great help to children's future mathematics Xi and application. Therefore, if children can memorize these key formulas more and lay a solid foundation, then they will be able to increase a lot of scores in their future math Xi.
