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The position of points on the number line

Source: licencja: CC 0.

Położenie punktów na osi liczbowej

Learning objectives

  • You will become familiar with the notion of coordinate on the number line.

Learning effect

  • You specify the position of points on the number line.

  • You mark points on the number line.

  • You describe the position of the points on the number line in English.

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nagranie abstraktu

Prepare the ruler and sticky notes with the following numbers written on them:

  •  -300, -250, -200, -150, -100, -50, 0, 50, 100

  •  -0.4, -0.2, 0, 0.2, 0.4, 0.6, 0.8, 1, 1.2

  • -10, -9, -8, -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10

and the sign of an arrow .

Today you are going to read and determine the numbers on the number linenumber linenumber line.

Choose the cards with numbers -3, -2, -1, 0, 1, 2, 3 and the arrow sign . Put them in front of you in the ascending order. Place the card with the highest number on the right side of the card with the sign of an arrow , the line with specified orientation, the arbitrary point 0 (the beginning) and the unit segment is called the number line.

Answer the following questions:

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nagranie abstraktu
  • What numbers are at the same distance from the beginning on the number line? How are they called?

  • Where can we use the models of the number lines in our everyday life?

Now choose the cards with numbers‑10, -8, -4, -2, 0, 2, 4 and the sign of an arrow . Put them in the ascending order. Place the card with the sign of an arrow , on the right side of the card with the highest number.

Discuss the examples of the numbers on the number line among the numbers -10, -8, -4, -2, 0, 2, 4. Do the same with the numbers -9, -6, -3, 0, 3, 6, 9.

Think of any examples of the numbers on the number line among the numbers -9, -6, -3, 0, 3, 6, 9.

Notice that:

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nagranie abstraktu
  • The numbers on the number linenumber linenumber line are put in the systematic way.

  • The orientation of the axisorientation of the axisorientation of the axis shows the ascending order of numbers.

  • The numbers which are at the same distance to the origin but lie at the opposite sides on the number linenumber linenumber line are called the opposite numbersopposite numbersopposite numbers.

Task 1
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nagranie abstraktu

Use the numbers -300, -250, -200, -150, -100, -50, 0, 50, 100, -0.4, -0.2, 0, 0.2, 0.4, 0.6, 0.8, 1, 1.2 written on the sticky notes. Draw two number lines. Mark the points corresponding with the numbers on the sticky notes. Stick the notes with the numbers in the appropriate places. Mark the opposite numbersopposite numbersopposite numbers with the same colour.

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nagranie abstraktu

Draw the number linenumber linenumber line. Determine the points 0, 1, 2, 3, 4, 5 and their opposite numbers.

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Source: GroMar, licencja: CC BY 3.0.
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nagranie abstraktu

Notice that:

  • The pointpointpoint on the number line is marked with the dot.

  • The number assigned to the point is called its coordinatecoordinatecoordinate.

Task 2
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nagranie abstraktu

Draw appropriate number lines and determine the points of the following coordinates:

  • -600, -300, -100, 0, 200

  • -3, -1,5, 3, 4,5, 6

  • -35, -15, 45, 125, 2

Task 3
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nagranie abstraktu

Place point M on the number linenumber linenumber line in the place specified with a given coordinatecoordinatecoordinate.

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Geogebra aplet - współrzędne punktu. Galeria z opisami alternatywnymi poniżej.
Source: GroMar, licencja: CC BY 3.0.

A hint: The negative numbers lie on the left side of 0, the positive ones on the right side of 0.

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nagranie abstraktu

Read the coordinate of pointpointpoint A.

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Source: GroMar, licencja: CC BY 3.0.
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nagranie abstraktu

Notice that:

  • The distance between the numbers 0 and 20 is divided into four identical segments.

  • Each of these segments equals five unit segments, i.e. 20 : 4 = 5.

  • The coordinate of point A equals 10, because 2 ⋅ 5 = 10.

Task 4
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nagranie abstraktu

Read the coordinates of point A:

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Source: GroMar, licencja: CC BY 3.0.
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Source: GroMar, licencja: CC BY 3.0.
Task 5

An extra task:

Draw the number linenumber linenumber line and determine:

  • all integersintegersintegers greater then -6 and not smaller then 4,

  • all positive multiple of the number 13 smaller than 100,

  • the opposite numbersopposite numbersopposite numbers to the numbers -1, -89, -39, 0, 19, 156.

Remember:

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nagranie abstraktu
  • The line with the specified direction, an arbitrary pointpointpoint 0 (the beginning) and the unit segment is called the number line.

  • The number assigned to the point is called its coordinatecoordinatecoordinate.

Do the summarising tasks.

Exercises

Exercise 1
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Source: GroMar, licencja: CC BY 3.0.
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Wersja alternatywna ćwiczenia: Read the coordinates of Point A: Możliwe odpowiedzi: 1. 38, 2. 19, 3. 39, 4. 57
zadanie
Source: GroMar, licencja: CC BY 3.0.
Exercise 2

Draw the appropriate number lines and indicate the points of following coordinates:

a) E = 90, M = -150, O = -120, S = 0, U = -60,

b) E = 60, H = -36, O = -12, R = 0, S = 24,

c) T = -1,2, I = -0,8, G = 0,4, E = 1,2, R = 1,6,

d) E = 57, K = 27, M = -37, N = 17, O = -17, Y = 117.

Exercise 3

Describe the position of the points A, D, K, S, T, W on the number line in English.

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Source: GroMar, licencja: CC BY 3.0.
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Exercise 4
Wersja alternatywna ćwiczenia: Indicate which pairs of expressions or words are translated correctly. Możliwe odpowiedzi: 1. oś liczbowa - number line, 2. zwrot osi - orientation of the axis, 3. odcinek jednostkowy - unit length, 4. punkt - point, 5. prosta - position, 6. liczby całkowite - opposite numbers
zadanie
Source: GroMar, licencja: CC BY 3.0.
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Interaktywna gra, polegająca na łączeniu wyrazów w pary w ciągu jednej minuty. Czas zaczyna upływać wraz z rozpoczęciem gry. Jeden ruch to odkrywanie najpierw jednej potem drugiej karty z wyrazem. Każdy wyraz jest odczytywany. Kolejny ruch to odkrywanie trzeciej i czwartej karty. W ten sposób odsłuchasz wszystkie wyrazy. Nawigacja z poziomu klawiatury za pomocą strzałek, odsłuchiwanie wyrazów enterem lub spacją. Znajdź wszystkie pary wyrazów.
Source: Zespół autorski Politechniki Łódzkiej, licencja: CC BY 3.0.

Glossary

coordinate
coordinate

współrzędna

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wymowa w języku angielskim: coordinate
integers
integers

liczby całkowite

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wymowa w języku angielskim: integers
multiple of a number
multiple of a number

wielokrotności liczby

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wymowa w języku angielskim: multiple of a number
number line
number line

oś liczbowa

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wymowa w języku angielskim: number line
opposite numbers
opposite numbers

liczby przeciwne

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wymowa w języku angielskim: opposite numbers
orientation of the axis
orientation of the axis

zwrot osi

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wymowa w języku angielskim: orientation of the axis
point
point

punkt

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wymowa w języku angielskim: point
position
position

położenie

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wymowa w języku angielskim: position
straight line
straight line

prosta

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wymowa w języku angielskim: straight line
unit length
unit length

odcinek jednostkowy

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wymowa w języku angielskim: unit length

Keywords

coordinatecoordinatecoordinate

number linenumber linenumber line

orientation of the axisorientation of the axisorientation of the axis

pointpointpoint

unit lengthunit lengthunit length