Understanding and calculation of numbers
In the early stage of mathematics learning, we need to understand and calculate numbers first. The understanding of numbers includes reading numbers and comparing numbers. The calculation of numbers includes addition, subtraction, multiplication and division.
Understanding of numbers
1. How to read numbers: We can know numbers by reading them. For example, the number "5" can be read as "five".
2. Comparison of numbers: We can know numbers by comparing their sizes. For example, the number "5" is greater than the number "3".
Calculation of quantity
1. Addition: Addition refers to the process of adding two or more numbers to get a sum. Such as "2+3=5".
2. subtraction: subtraction refers to the process of subtracting another number from one number to get the difference. Such as "5-3=2".
3. Multiplication: Multiplication refers to the process of multiplying two or more numbers to get a product. For example, "2×3=6".
Division: Division refers to the process of dividing a number into several parts. For example, "6÷3=2".
Understanding and drawing of geometric figures
Geometric figure is an important concept in mathematics, and we need to know the basic shape and characteristics of geometric figure. At the same time, we also need to master how to draw geometric figures.
The basic shape of a geometric figure
1. Point: The point is the simplest geometric figure, without length, width and height.
2. Line segment: A line segment is a geometric figure consisting of two endpoints and a line segment between them.
3. Straight line: A straight line is a geometric figure composed of countless points, and it has no endpoints.
4. Angle: An angle is a geometric figure composed of two line segments or rays.
5. Triangle: A triangle is a geometric figure composed of three line segments.
6. Quadrilateral: Quadrilateral is a geometric figure composed of four line segments.
Drawing of geometric figures
1. stippling: We can use a ruler or a ruler to draw dots.
2. Drawing of line segments: We can draw line segments with a ruler or a ruler.
3. Draw a straight line: We can draw a straight line with a ruler or a ruler.
4. Draw angles: We can draw angles with a ruler or a ruler.
5. Drawing of triangles: We can draw triangles with a ruler or a ruler.
6. Draw a quadrilateral: We can draw a quadrilateral with a ruler or a ruler.
Understanding and calculation of time
Time is an essential concept in our daily life, and we need to know the basic concept and calculation method of time.
The basic concept of time
1. Reading time: We can know the time by reading time. For example, 8: 30 can be read as 8:30.
2. Comparison of the size of time: We can know time by comparing the size of time. For example, 8:30 is before 9:00.
Calculation of time
1. addition: In the addition of time, we need to add hours and minutes respectively. For example, "8: 30 +0: 30 =9 o'clock".
2. subtraction: in the subtraction of time, we need to subtract hours and minutes respectively. For example, "9:00-0:30=8:30".