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The ratio of two values

Source: licencja: CC 0.

Stosunek dwóch wielkości

Learning objectives

  • You will learn to identify the ratio of two values.

Learning effect

  • You identify the ratio of two values.

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nagranie abstraktu

Give examples of common fractions and applying them in real situations (fractions as parts of a whole or as a quotient of two numbers).

Write down given fractions without the fraction barfraction barfraction bar and identify the meaning of the numerator (the dividenddividenddividend), the denominator (the divisordivisordivisor) and the fraction barfraction barfraction bar (the sign of division).

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nagranie abstraktu
How to identify ratio of lengths of line segments?

Prepare a stick that will be a unit of length for measurements. Then sticks equal to 2 units of length, 3 units of length and 6 units of length.

On a piece of paper draw the AB line segment whose length is 24 (applying the ‘stick’ units) and the CD line segment whose length is 6.

Your task is to measure line segments AB and CD with sticks and write in the form of a quotient how many times the line segment AB (as well as CD) is longer than each stick.

Write down how many times the line segment AB is longer than the line segment CD, also in the form of the quotientquotientquotient.

Task 1
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nagranie abstraktu

Your task is to observe the way of determining the ratio of line segments and to draw conclusions about the ratio of two valuesratio of two valuesratio of two values.

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Geogebra aplet - Stosunek dwóch wielkości. Galeria z opisami alternatywnymi poniżej.
Source: GroMar, licencja: CC BY 3.0.
The ratio of two values
Definition: The ratio of two values
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nagranie abstraktu

The ratio of two valuesratio of two valuesratio of two values is the quotientquotientquotient of these values. We write it down in the form of a quotient of natural numbers, using the division sign or as a common fraction.

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nagranie abstraktu

Use obtained information in exercises.

Task 2
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nagranie abstraktu

There are two line segments a and b of given values. Calculate the ratio of the length of the line segment a to the line segment b. Write the result as a quotient and as a common fraction.

a) a = 3 dm and b = 12 cm.

b) a = 27 mm and b = 9 cm.

Task 3
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nagranie abstraktu

Present the ratio of given numbers as a quotient of natural numbers, without using the sign of division and in the form of a common fraction.

a) 112:6

b) 3:314

c) 213:12

Task 4
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nagranie abstraktu

The ratio of two numbers is 3 : 1, and their difference is 16. Find those two numbers.

Task 5
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nagranie abstraktu

The ratio of the number of girls to the number of boys in one of the classes is 3 : 8. What is the ratio of the number of boys to the number of all students in this class?

Task 6
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nagranie abstraktu

An extra task:

An alloy of silver and copper weighs 68 g.

How many grams of copper is in this alloy, if the ratio of the mass of copper to the mass of silver is equal to 4 : 13?

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nagranie abstraktu

Do the revision exercises.

Exercises

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Exercise 1
Wersja alternatywna ćwiczenia: The ratio of lengths of line segments a and b is equal to 3:5. The line segment b is 35 cm long. Therefore the length of the line segment a is: Możliwe odpowiedzi: 1. 21 cm, 2. 28 cm, 3. 18 cm, 4. 16 cm
Rzadanie
Source: GroMar, licencja: CC BY 3.0.
Exercise 2

A rod that is 28 cm has to be cut into two parts, in 3 : 4 ratio. What will be the length of the shorter part of the rod?

Exercise 3

Identify the ratio of 1 hour to 40 minutes.

Describe the solution in English.

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Exercise 4
Wersja alternatywna ćwiczenia: Indicate which pairs of expressions or words are translated correctly. Możliwe odpowiedzi: 1. stosunek dwóch wielkości - ratio of two values, 2. iloraz liczb naturalnych - quotient of natural numbers, 3. stosunek długości odcinków - ratio of the length of line segments, 4. wędrujące plakaty - wandering posters, 5. dzielna - divisor, 6. iloraz - divisor
Rzadanie
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

dividend
dividend

dzielna

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wymowa w języku angielskim: the dividend
divisor
divisor

dzielnik

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wymowa w języku angielskim: divisor
fraction bar
fraction bar

kreska ułamkowa

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wymowa w języku angielskim: the fraction bar
quotient
quotient

iloraz

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wymowa w języku angielskim: the quotient
quotient of natural numbers
quotient of natural numbers

iloraz liczb naturalnych

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wymowa w języku angielskim: quotient of natural numbers
ratio of the length of line segments
ratio of the length of line segments

stosunek długości odcinków

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wymowa w języku angielskim: ratio of the length of line segments
ratio of two values
ratio of two values

stosunek dwóch wielkości

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wymowa w języku angielskim: ratio of two values
wandering posters
wandering posters

wędrujące plakaty

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wymowa w języku angielskim: wandering posters

Keywords

ratio of two valuesratio of two valuesratio of two values – jest to iloraz wartości tych wielkości

ratio of the length of line segmentsratio of the length of line segmentsratio of the length of line segments – wyrażony jest za pomocą ilorazu liczb naturalnych

quotient of natural numbersquotient of natural numbersquotient of natural numbers