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Comparing fractions with the same numerators or denominators

Source: licencja: CC 0.

Porównywanie ułamków o jednakowych licznikach lub mianownikach

Learning objectives

  • You will learn the rules of comparing fractions with the same numerators and denominators.

Learning effect

  • You will learn to compare fractions with the same numerators and denominators.

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nagranie abstraktu

Revise how we write down the common fractioncommon fractioncommon fraction and its parts and what they mean: the numeratornumeratornumerator, the denominatordenominatordenominator and the fraction bar. Give two examples of marking fractions on the number linenumber linenumber line.

  • The common fractioncommon fractioncommon fraction consists of the numeratornumeratornumerator, the denominatordenominatordenominator and the fraction bar.

  • The denominatordenominatordenominator indicates how many equal parts the whole has been divided into.

  • The numeratornumeratornumerator indicates how many parts have been taken.

  • To determine the coordinates of the point described by a fraction, we need to check into how many parts the unit segment was divided and how many marked parts there are between the point and 0.

Task 1
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nagranie abstraktu

Two identical pizzas were divided into 12 equal parts. Marek ate a piece of one pizza, and Darek ate 5 pieces of the other pizza.

a) What part of each pizza was left?

b) What fraction of each pizza is this?

c) Which pizza remains larger now?

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Source: GroMar, licencja: CC BY 3.0.
Task 2
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nagranie abstraktu

Draw a number linenumber linenumber line and mark the fractions 49 and 79, and then write down which number is greater.

Task 3
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nagranie abstraktu

Draw two equal rectangles and then divide the first one into 3 equal parts and the other into 8 equal parts. In each of them, they mark one part with a colour. Their task is to write down in the form of a fraction what part of the rectangle was coloured and determine which one of them is greater.

Task 4
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nagranie abstraktu

Open the applet. Observe how the relation between the fractions marked in the applet changes, depending on the numbers occurring in the numerators and the denominators of the fractions. After completing the exercise, write down the results of your observations.

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Geogebra aplet - porównywanie ułamków zwykłych. Galeria z opisami alternatywnymi poniżej.
Source: GroMar, licencja: CC BY 3.0.
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nagranie abstraktu

Conclusions

  • If two fractions have equal denominators, then the one that has a greater numeratorgreater numeratorgreater numerator is greater.

  • If two fractions have equal numerators, then the one that has smaller denominatordenominatordenominator is greater.

Task 5
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nagranie abstraktu

An extra task

Write down all fractions whose numeratornumeratornumerator is 8 which are greater than 15 and smaller than 1.

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nagranie abstraktu

Do the revision exercises.

Exercises

Exercise 1
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Wersja alternatywna ćwiczenia: Determine which sentences are true. Możliwe odpowiedzi: 1. 710>610, 2. 28>25, 3. 34>314, 4. 57>47, 5. 821>1221
zadanie
Source: GroMar, licencja: CC BY 3.0.
Exercise 2

Draw the number line, choose the proper unit and mark the fractions:

1011 , 311 , 811 , 211 , 711 , 111 , 1111 , 511,

Write the fractions in the descending order.

Exercise 3

Kasia bought 57m of the pink ribbon, 58m of the blue ribbon and 38m of the red ribbon. Which ribbon did she buy the most and which one the least? Justify your answer in English.

Exercise 4
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Wersja alternatywna ćwiczenia: Indicate which pairs of expressions or words are translated correctly. Możliwe odpowiedzi: 1. porównywanie - comparing, 2. licznik - the numerator, 3. mianownik - the denominator, 4. oś liczbowa - the number line, 5. większy licznik - greater denominator, 6. większy mianownik - greater numerator
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

common fraction
common fraction

ułamek zwykły

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wymowa w języku angielskim: common fraction
denominator
denominator

mianownik

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wymowa w języku angielskim: denominator
greater numerator
greater numerator

większy licznik

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wymowa w języku angielskim: greater numerator
number line
number line

oś liczbowa

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wymowa w języku angielskim: number line
numerator
numerator

licznik

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wymowa w języku angielskim: numerator

Keywords

common fractioncommon fractioncommon fraction

numeratornumeratornumerator

denominatordenominatordenominator