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Negative numbers in everyday life

Source: licencja: CC 0.

Liczby ujemne w życiu codziennym

Learning objectives

You will discover the negative numbers.

Learning effect

  • You give the example of using the negative numbers in practical situations.

  • You read the temperature.

  • You use English to describe the negative numbers.

Today you are going to discover which numbers are positive and which ones are negatives.

We use negative numbers to write down the air temperaturetemperaturetemperature, to describe the place below sea level (a depressiondepressiondepression) or to represent a debit on a bank account.

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Source: GroMar, licencja: CC BY 3.0.

Analyse the temperaturetemperaturetemperature during the day and at night in some Polish cities. Using the information on the map they answer the following questions:

  • What city was the coldest at night?

  • What was the temperaturetemperaturetemperature during the day in Gdańsk?

  • What city had the day temperaturetemperaturetemperature of 5°?

  • How many degrees was the temperaturetemperaturetemperature during the day in Katowice higher than at night?

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Pokaz slajdów przedstawia położenie punktów nad poziomem morza i pod poziomem morza za pomocą liczb dodatnich i ujemnych. Instrukcja obsługi z poziomu klawiatury: 1. Uruchomienie aplikacji - ENTER, 2. Na każdym ze slajdów czytany jest automatycznie tekst alternatywny po polsku, 3. Przy pierwszym uruchomieniu na pierwszym slajdzie, czytanie tekstu po angielsku - TAB, 4. Przejście między slajdami: do następnego slajdu - TAB, do poprzedniego slajdu - TAB + SHIFT, 5. Przejście do czytania napisu po angielsku - strzałka w górę + strzałka w dół (czyta tekst po angielsku widoczny na slajdzie).
Source: GroMar, licencja: CC BY 3.0.

Watch the slideshow. You are going to watch the position of the numbers on the number line.

  • The negative numbersnegative numbersnegative numbers are placed on the left from zero on the number line.

  • The numbers  -4, -3, -2, -1, 0, 1, 2, 3, 4, … are called the integersintegersintegers.

Task 1
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nagranie abstraktu

In a hotel apart from 9 floors above the ground there are 6 floors under the ground. The underground floors are marked on the buttons in the lift with the numbers – 1, - 2, - 3, etc.

a) Which button should be pressed by the hotel guest who wants to get to the second floor under the ground? b) Kasia got on the lift marked with number – 6. How many times had the lift stopped before she got off the seventh floor? c) Maria came out of the room 47, which is situated on the fourth floor and went five floors down. What floor did she get off the lift?

Task 2
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nagranie abstraktu

How many natural numbers larger than -11 and smaller than 11 are there? How many integersintegersintegers fulfil the condition?

Task 3
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nagranie abstraktu

Julia has checked her bank account balance which was -300 PLN. Not looking at her bank debit she spent 100 PLN on her shopping in the supermarket. How much is her account balance now? How much will it be after she gets her salary of 2500 PLN?

Task 4
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nagranie abstraktu

Hania, Marysia, Kasia, Zosia, Bartek, Piotrek and Tomek went to the three floor shopping mall. There are also three floors under the ground where the car parks are situated. Since everybody had different interests they went to the different parts of the mall. At one moment they all were on the different floors. Which floor was Zosia on if:

  • Bartek was on the floor whose number is negative,

  • Marysia was on a floor whose number is even,

  • Hania was two floors lower than Bartek,

  • Kasia was four floors lower than Marysia,

  • Tomek was on the floor between the floors of Piotrek and Marysia.

  • The positive numbers are situated on the right from zero on the number line.

  • The negative numbersnegative numbersnegative numbers are situated on the left from zero on the number line.

  • The numbers: …, -4, -3, -2, -1, 0, 1, 2, 3, 4, … are called the integersintegersintegers.

Check what you have learned by doing the following tasks.

Exercises

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Exercise 1
Wersja alternatywna ćwiczenia: Determine which sentences are true. Możliwe odpowiedzi: 1. Kasia said she had 50 PLN, her brother Rafał -65 PLN. Kasia said he had a debt of 65 PLN., 2. Every student in a school can get positive points for being active and negative points for talking during the lesson., 3. The KRZAK company suffered loss of 30000 PLN in 2018, that it is written as +30000 PLN.
Exercise 2

Write down the air temperaturetemperaturetemperature in your city for a week. Then, calculate the average temperaturetemperaturetemperature of the week.

Exercise 3

Write down all the integers larger than -7 and smaller than 2.

Describe the positive and the negative numbersnegative numbersnegative numbers in English.

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Exercise 4
Wersja alternatywna ćwiczenia: Indicate which pairs of expressions or words are translated correctly. Możliwe odpowiedzi: 1. liczba ujemna - negative numbers, 2. liczba dodatnia - positive number, 3. liczba całkowita - integers, 4. temperatura - temperature, 5. depresja - debt, 6. strata - integers
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

debt
debt

dług

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wymowa w języku angielskim: debt
depression
depression

depresja

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wymowa w języku angielskim: depression
integers
integers

liczba całkowita

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wymowa w języku angielskim: integers
loss
loss

strata

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wymowa w języku angielskim: loss
negative numbers
negative numbers

liczba ujemna – to liczba mniejsza od zera

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wymowa w języku angielskim: negative numbers
penalty points
penalty points

punkty karne

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wymowa w języku angielskim: penalty points
positive number
positive number

liczba dodatnia – to liczba większa od zera

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wymowa w języku angielskim: positive number
temperature
temperature

temperatura

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wymowa w języku angielskim: temperature

Keywords

depressiondepressiondepression

integersintegersintegers

negative numbersnegative numbersnegative numbers

positive numberpositive numberpositive number

temperaturetemperaturetemperature