The first step is to write the topic on white paper: the first grade calculation card; Step 2, then draw exercise books and pencils on the left; Step 3, draw a green rectangular text box in the middle of the white paper;

Step 4, write the formula in the green text box: 8+5; Step 5, then draw 8 strawberries and 5 strawberries on the right; Step 6, finally draw a circle in the upper left corner of the white paper to fix the binding position. In this way, the calculation card is ready.

Introduction to primary school mathematics:

Through teaching materials, children are taught a series of knowledge about number, four operations, formulas for calculating figures and lengths, unit conversion and so on, laying a good mathematical foundation for junior high school calculation and daily life. Frieden Noel, a Dutch educator, said: "Mathematics comes from reality and must be rooted in reality and applied to reality."

Indeed, modern mathematics requires us to observe the world from a mathematical perspective and explain the world in mathematical language. Judging from the mathematics learning psychology of primary school students, the learning process of students is not a passive absorption process, but a reconstruction process based on existing knowledge and experience.

Therefore, learning while doing and learning while playing will make children learn more actively. From our educational goal, while imparting knowledge, we should pay more attention to cultivating students' comprehensive ability of observation, analysis and application.

Four operations:

Additive commutative law (a+b=b+a), additive associative law (a+(b+c)=(a+b)+c), multiplicative commutative law (a*b=b*a), multiplicative associative law (a*(b*c)=(a*b)*c), and multiplicative distributive law. Subtraction properties: a-(b+c)=a-b-c, a-(b-c) = a-b+c.