2. Common statistical charts include bar chart, line chart and fan chart.
3. Bar chart: Use a unit length to represent a certain quantity, draw straight lines with different lengths according to this quantity, and then arrange these straight lines in a certain order. (Function: It is easy to see the quantity from the bar chart)
4. Broken line statistical chart: a unit length is used to represent a certain quantity, points are drawn according to the quantity, and then the points are connected in turn by line segments. (Function: The broken line statistical chart can not only show the quantity, but also clearly show the change of the quantity. )
There are five algorithms * * *: additive commutative law, additive associative law, multiplicative commutative law, multiplicative associative law and multiplicative distributive law. It is required to master on the basis of understanding and be able to use it flexibly.
The nature of operation refers to: one number plus the difference between two numbers; One number MINUS the sum of two numbers; One number MINUS the difference between two numbers; The quotient of one number multiplied by two numbers; A number divided by the product of two numbers; The quotient of one number divided by two numbers; The sum of several numbers divided by a number, etc. This part is only used for simple operation.
Algorithms include: integer four algorithm, decimal four algorithm and fractional four algorithm. It is required to master the rules on the basis of understanding and be skilled in using the rules for calculation.
Related knowledge points can pay attention to the general education primary school mathematics curriculum in Beijing New Oriental Primary School, and I believe it can help you ~