Topicm64f8b08cb8da7861_1528449000663_0Topic

Working with problem sets – integers

Levelm64f8b08cb8da7861_1528449084556_0Level

Second

Core curriculumm64f8b08cb8da7861_1528449076687_0Core curriculum

III. IntegerintegerInteger numbers. The student:

2) Interprets integers on the number linenumber linenumber line;

3) calculates the absolute valueabsolute valueabsolute value of a number;

4) compares integers.

Timingm64f8b08cb8da7861_1528449068082_0Timing

45 minutes

General objectivem64f8b08cb8da7861_1528449523725_0General objective

Reading and interpreting data presented in various forms as well as processing them.

Specific objectivesm64f8b08cb8da7861_1528449552113_0Specific objectives

1. Communication in English, developing mathematical, IT and basic scientific and technical competence, developing learning skills.

2. Consolidation of information about integers.

3. Solving problems with the application of information about integers.

Learning outcomesm64f8b08cb8da7861_1528450430307_0Learning outcomes

The student:

- interprets integers on the number linenumber linenumber line,

- calculates the absolute valueabsolute valueabsolute value of an integerintegerinteger,

- compares integers.

Methodsm64f8b08cb8da7861_1528449534267_0Methods

1. Chain of association.

2. Morphological analysis.

Forms of workm64f8b08cb8da7861_1528449514617_0Forms of work

1. Individual work.

2. Group work.

Lesson stages

Introductionm64f8b08cb8da7861_1528450127855_0Introduction

Students work in groups. The teacher gives every group a “chain” of empty links, which the students have to complete with already introduced concepts or other associations connected with integers.

During the presentation of the “chains”, the students pay attention to the elements repeating in the “chains”.

They cooperate to make a list of the topics connected with integers, which they have already met.

- Integers on the number linenumber linenumber line.
- Comparing integers.
- The absolute valueabsolute valueabsolute value of an integerintegerinteger.

The teacher informs the students that systematizing knowledge and developing skills in these areas will be the aim of the class.

Procedurem64f8b08cb8da7861_1528446435040_0Procedure

The students are randomly divided into three groups. They are going to work using the morphological analysis method.

For a start, every group solves the assigned tasks. Next, on the basis of the tasks and using their knowledge (the students can also look for information on the Internet) the students work out the most important aspects of the assigned topic. They prepare posters.

Group 1 - integers on the number linenumber linenumber line.

Task 1
On a piece of squared paper, draw the number linenumber linenumber line and mark the following numbers on it:

a. -5, -1, 2, 4,
b. -20, -10, 0, 10, 30,
c. -101, -102, -103, -104,
d. – 200, -150, 100.

Does the number linenumber linenumber line unit always correspond to the length of the square on the paper? What do you notice?

Task 2
A ladybird is moving on the number linenumber linenumber line. First, it was on the point corresponding to number (-7). Then, it made 8 steps forward and two steps backwards. What is the number corresponding to the point where it syopped?

Task 3
In the evening the air temperature was 3°C. During the night it fell by 10°C. At dawn it rose by 2°C. Prepare a graphic representation of this situation.

Say, what temperature of the air in the morning was.

Task 4
Invent two tasks connected with marking numbers on the number linenumber linenumber line. Ask Group 2 to solve your tasks.

Group 2 - comparing integers.

Task 1
Play a game - Comparing integers. One by one, give two integers, greater than (-6) and smaller than 15. Decide which one of them is greater. Check the correctness of your answer with the applet.

[Geogebra applet 2]

Task 2
Order the following numbers from the smallest to the greatest: 6, (-4), 10, 18, (-20), 0, 5, (-1).

Task 3
Give an example of four numbers a, where:

a. a > -7,
b. a < -5,
c. -11 < a < 8,
d. -500 < a < -380.

Task 4
Invent two tasks connected with comparing integers. Ask Group 3 to solve them.

Group 3 - the absolute valueabsolute valueabsolute value of an integerintegerinteger.

Task 1
Complete the sentences.

The opposite number of 8 is …
The opposite number of (-1) is …
Numbers 18 and … are opposite numbersopposite numbersopposite numbers.

Task 2
Revise the concept of the absolute valueabsolute valueabsolute value using the applet.

[Geogebra applet 2]

Calculate the absolute values of: 7, (-3), 11, (-5), 21, 138, (-250).

Task 3
Find number x when you know that:

a. |x| = 9 and x < 3,
b. |x| < 2 and x < 0,
c. |x| = 5 and x > 2.

Task 4
Invent two tasks connected with calculating the absolute valueabsolute valueabsolute value of an integerintegerinteger. Ask Group 1 to solve them.

The groups present the results of their work and their posters. They discuss the task which they got from other groups. The teacher assesses their work and explains doubts.

Lesson summarym64f8b08cb8da7861_1528450119332_0Lesson summary

The students do the consolidation tasks. They cooperate to summarize the class and formulate conclusions which they should remember.

- The numbers located on the left side of the number line are negative numbers.m64f8b08cb8da7861_1527752263647_0The numbers located on the left side of the number line are negative numbers.
- A greater number is located on the right side of a smaller number on the number line.m64f8b08cb8da7861_1527712094602_0A greater number is located on the right side of a smaller number on the number line.
- Opposite numbers have the same absolute value.m64f8b08cb8da7861_1527752256679_0Opposite numbers have the same absolute value.

Selected words and expressions used in the lesson plan

absolute valueabsolute valueabsolute value

comparing numberscomparing numberscomparing numbers

integerintegerinteger

negative numbernegative numbernegative number

number greater than 0number greater than 0number greater than 0

number linenumber linenumber line

number smaller than 0number smaller than 0number smaller than 0

opposite numbersopposite numbersopposite numbers

positive numberpositive numberpositive number

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integer1
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liczba całkowita

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oś liczbowa

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wartość bezwzględna

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liczby przeciwne

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liczba ujemna

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liczba większa od 0

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liczba dodatnia

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