Jiangsu Education Edition Seventh Grade Mathematics Volume I Teaching Plan (1)
2.2 number axis (1)
First, the teaching objectives, teaching difficulties analysis
(A) Teaching objectives
(1) can correctly draw the number axis according to the three elements that make up the number axis;
(2) Learn to say the number it represents from the known points on the number axis, and use the points on the number axis to represent rational numbers.
(B), heavy and difficult type
Key points: Say the number it represents from the known points on the number axis, and use the points on the number axis to represent rational numbers. Difficulties: draw the number axis correctly according to the three elements that make up the number axis;
Second, the teaching process
Let the students observe the thermometer.
.
The straight line that defines the origin, positive direction and unit length like this is called the number axis.
Guide students to sum up: to draw the number axis correctly, the origin, positive direction and unit length of the three elements of the number axis are indispensable; Draw a number axis, then any rational number can be represented by points on the number axis. The number axis is
A very important mathematical tool, it establishes the corresponding relationship between numbers and points on a straight line, reveals the internal relationship between numbers and shapes, and provides us with a new method to study problems.
(III) Summary
(1) Axis has three elements, and the axis is drawn: origin, positive direction and unit length.
(2) A rational number can be represented by a point on the number axis, and the number it represents can be said from a known point on the number axis.
Jiangsu education edition seventh grade mathematics first volume teaching plan (2)
2.2 Number Axis (2)
First, the teaching objectives, teaching difficulties analysis
(A) Teaching objectives
(1). Can further master the three elements of the number axis and draw the number axis correctly;
(2) Learn to say the number it represents from the known points on the number axis, and use the points on the number axis to represent rational numbers;
(3) The number axis will be used to compare the size of rational numbers;
(B), heavy and difficult type
Emphasis and difficulty: the number axis will be used to compare the size of rational numbers;
(III) Summary
Teachers and students * * * together to sum up:
Of the two numbers represented on the 1. number axis, the number on the right is always greater than the number on the left;
2. Positive numbers are greater than zero, negative numbers are less than zero, and positive numbers are greater than negative numbers.
Su Jiaoban seventh grade mathematics first volume teaching plan (3)
2.3 Category I: Absolute value
First, the teaching objectives, teaching materials difficult analysis
1, teaching objectives:
(1) Understand the concept of absolute value of rational number and master its representation;
(2) Master the method of finding the absolute value of rational numbers; ⑶ Understand the geometric meaning of absolute value.
2 emphasis: the method of finding the absolute value of rational number.
Difficulty: the geometric meaning of absolute value
Second, the teaching process:
1 Preparation before class
2 investigation activities
3 inductive summary
(1). The absolute value of a positive number is itself;
(2) The absolute value of zero is zero;
(3) The absolute value of a negative number is its reciprocal.
(4)、
Step 3: Self-test
2.3 The second category: inverse number
1, teaching objectives:
(1) Understand the meaning of reciprocal and master how to find the reciprocal of a known number;
(2) Learn to draw points representing opposite numbers on the number axis and experience the idea of combining numbers with shapes.
Point 2: Find the reciprocal of the known number.
Difficulty: Draw points representing opposite numbers on the number axis.
Second, the teaching process
1 Preparation before class
1( 1) Write the antonyms of the following numbers respectively: 5, -7, 3,+1 1.2, a 2.
(2) Simplify the following numbers: (1)-(10); (2)+(-0. 15); (3)+(+3); (4)-(-20).
2 investigation activities
1, Create a situation: (1) Let the students draw points representing the following two logarithms on the number axis: -6 and 6, 1.5 and-1.5.
(2) Ask students to analyze the positions of the above points on the number axis and talk about your findings. 2. The meaning of the opposite number: As mentioned above, only two numbers with different signs are called the opposite number.
3. Practice (see textbook)
3 inductive summary
Third, self-test:
Articles related to the first volume of seventh grade mathematics teaching plan published by Jiangsu Education Publishing House;
1. seventh grade last semester math teaching plan Jiangsu education edition
2. The final examination paper of the first volume of the seventh grade mathematics of Jiangsu Education Edition.
3. Su Ke Edition Mathematics Book 1 Algebra Review Questions and Answers.
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5. Jiangsu Education Edition Seventh Grade Mathematics Teaching Plan