Math 6 Chapter 2 Lesson 1: Getting to know negative integers
1. Summary of theory Tóm
1.1. Negative integer
In fact, people also use integers with a minus sign in front. For example, winter temperatures at the top of Mau Son can sometimes drop to -20C. A natural number with a minus sign in front is called a negative integer.
1.2. Shaft No.
We represent negative integers on the opposite ray of the number ray. Then we get a number line.
Thus, a number line is a line on which the zero point is chosen, called the origin, usually choose the direction from left to right as the positive direction and a unit length, each natural number is represented by a point to the right. point 0, each negative integer is represented by a point to the left of point 0.
2. Illustrated exercise
Question 1: People also use integers to indicate the time before BC. For example, the mathematician Pythagoras was born in -570 which means he was born in 570 BC. Write down the number (vowel) indicating the year the first Olympics were held, given that it took place in 776 BC.
The first Olympics were held in -776 (negative seven hundred and seventy-six).
Verse 2: Draw a number line and show: Points that are two units away from zero, zero units, and two pairs of points equidistant from zero.
Points that are two units away from point 0 are 2 and -2, and the distance from zero is zero. Two pairs of points are equidistant from zero, for example: 3 and -3, 4 and -4
Question 3: On the number line, point 3 is 3 units away from point 0 in the positive direction, point -3 is 3 units away from point 0 in the negative direction.
Fill in the blanks with the following sentences:
a. Point -2 is far from point 2 is … units in the direction of…
b. Point 1 away from point -3 is …. dimensional units….
a. Point -2 is 4 units away from point 2 in the negative direction
b. Point 1 is 4 units away from point -3 in the positive direction.
3.1. Essay exercises
Question 1: Draw a number line and indicate:
a) Points located four units away from point 3 3
b) Points between -4 and 2
Verse 2: Arrange the following integers in ascending order:
-54; 65; -35; 0; twelfth; 45; -17
Question 3: Arrange the following integers in descending order:
24; -19; -20; 3; 2; -108; -96
3.2. Multiple choice exercises Bài
Question 1: What is the origin on the number line?
A. Score 0
B. Score 1
C. Score 2
D. Score -1
Verse 2: How many units away from point -4 is point 4?
Question 3: What are the points 2 three units away from the point?
C. -1 and 5
D. 1 and 5
Question 4: The direction from wrong to right in the number line is called?
A. Negative dimension
B. Positive direction
D. Reverse direction
Through this lesson Get familiar with negative integers, you need to complete some of the objectives given by the lesson, such as:
- Know what negative integers are.
- How to represent negative integers on the number line.