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Converting mixed numbers into fractions

Source: licencja: CC 0.

Zamiana liczb mieszanych na ułamki

Learning objectives

Learning concepts: proper fractions, improper fraction and mixed number.

Learning effect

  • You will learn to convert an improper fraction into a mixed number and  a mixed number into an improper fraction.

Introduction

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nagranie abstraktu

Prepare 12 squares, each having a side 12 cm long. 4 green squares are divided into 6 equal parts, 4 blue squares are divided into 5 equal parts and 4 red squares are divided into 3 equal parts. Prepare also a template with 4 such squares.

Revise the concept of the fraction. A fraction describes a part of a whole divided into equal parts. Choose a square of each colour. On one of the three drawn on the template squares put one by one fractions: 56,34,13 by filling the right part of the drawn square with right cards.

Task 1
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nagranie abstraktu

Answer the questions, compare your answers with the following conclusions:

  • How many blue pieces we need to fill more than two squares?

  • How many green pieces we need to fill more than three squares?

  • How many red parts we need to fill more than one square?

  • How to describe the filled parts with fractions?

Conclusions:

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nagranie abstraktu
  • To fill more than one square drawn on the template, the number of coloured parts of the square must be greater than the number of parts the square of a given colour got divided into.

  • Fractions with which we can describe filled parts of the squares on the templates can be in the form of 125,216,53.

Task 2
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nagranie abstraktu

Use all the prepared coloured parts. On the template, put one by one fractions 125,216,53 by filling appropriate parts of the drawn squares with appropriate cards. Pay attention to the fact that you will fill more than one square.

Task 3
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nagranie abstraktu

Write down the fractions that occurred in the first stage on the left side of the piece of paper and those that occurred in the second stage on the right side. Think about the difference between them.

Conclusions:

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nagranie abstraktu
  • Fractions on the left side are numbers smaller than 1. The numerator of these fractions is smaller than the denominator. They are called proper fractions.

  • Fractions on the right side are numbers greater than 1. The numerator of these fractions is greater than the denominator. They are called improper fractions.

  • If the numerator and the denominator are equal, then the fraction is improper.

Task 4
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nagranie abstraktu

Stick 12 equal blue parts in their notebooks, creating squares. Write down how many squares you obtain and how many parts are left.

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Source: GroMar, licencja: CC BY 3.0.

Conclusions:

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nagranie abstraktu

125 of a square are 2 whole squares and 25 of a square:

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Source: GroMar, licencja: CC BY 3.0.

Mixed numbermixed numberMixed number consists of two parts: whole part and fractional part.

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Mixed number
Source: GroMar, licencja: CC BY 3.0.
Task 5
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nagranie abstraktu

Think about the operations that need to be performed in order to convert improper fractionimproper fractionimproper fraction into mixed numbermixed numbermixed number. Using the following drawings, write down the fraction 52 as a mixed number.

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Source: GroMar, licencja: CC BY 3.0.

Conclusions:

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nagranie abstraktu
  • We need to do the operation: 5:2=2 r 1, therefore 52=212.

  • The quotient of the division of the numerator by the denominator of the improper fractionimproper fractionimproper fraction is the whole part of the mixed numberwhole part of the mixed numberwhole part of the mixed number and the rest is the numerator of the fraction.

Task 6
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nagranie abstraktu

Convert mixed numbers into improper fractions.

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Aplet geogebry: Liczby mieszane na osi liczbowej. Poniżej znajdują się ilustracje stawiące alternatywę do apletu.
Source: GroMar, licencja: CC BY 3.0.
Task 7
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nagranie abstraktu

Write down the improper fractions in the form of mixed numbers: 156,153,159.

Task 8
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nagranie abstraktu

Think about the operations that need to be done to convert the mixed number into the improper fractionimproper fractionimproper fraction. Using the drawing below, write down the mixed number 212 in the form of improper fractions.

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Source: GroMar, licencja: CC BY 3.0.

Conclusions:

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nagranie abstraktu
  • We need to do the operation: 2·2+1=5, therefore 212=2·2+12=52.

  • Converting a mixed numbermixed numbermixed number into a fraction we need to calculate the numerator of the fraction. The denominator is the same as the denominator of the fractional part of the mixed numberfractional part of the mixed numberfractional part of the mixed number.

Task 9
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nagranie abstraktu

Write down the mixed numbers in the form of improper fractions: 213,435,157.

Task 10

An extra task:

Write down all fractions whose numerator is 6, that are not smaller than 1 and are not greater than 2.

Remember:

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nagranie abstraktu
  • Proper fractionproper fractionProper fraction is a fraction whose numerator is smaller than the denominator.

  • Improper fractionimproper fractionImproper fraction is a fraction whose numerator is greater than the denominator.

  • Mixed numbermixed numberMixed number consists of two parts: whole part and fractional part.

  • The quotient of the division of the numerator by the denominator of the improper fraction is the whole part of the mixed numberwhole part of the mixed numberwhole part of the mixed number and the rest is the numerator of the fraction. 

  • Converting a mixed number into a fraction we need to calculate the numerator of the fraction. The denominator is the same as the denominator of the fractional part of the mixed numberfractional part of the mixed numberfractional part of the mixed number.

Do the revision exercises.

Exercises

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Exercise 1
Wersja alternatywna ćwiczenia: Decide which improper fractions are greater than 4 and smaller than 5. Możliwe odpowiedzi: 1. 266, 2. 143, 3. 167, 4. 113, 5. 255
Exercise 2

Mark the numbers on the number line: 12,234,112,34,314,114,74,104.

Choose proper units.

Exercise 3

Out of the following common fractions, write down fractions greater and equal to 1.

25,52,57,1211,215,218,314.

a) How are these fractions called? What can we say about their numerators and denominators?

b) Write the fractions in the form of mixed numbers. What parts they consist of? Give the 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. ułamek zwykły - common fraction, 2. liczba mieszana - mixed number, 3. ułamek właściwy - proper fraction, 4. ułamek niewłaściwy - improper fraction, 5. część całkowita liczby mieszanej - fractional part of the mixed number, 6. reszta z dzielenia liczb naturalnych - fractional part of the mixed number
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
fractional part of the mixed number
fractional part of the mixed number

część ułamkowa liczby mieszanej

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wymowa w języku angielskim: fractional part of the mixed number
improper fraction
improper fraction

ułamek niewłaściwy

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wymowa w języku angielskim: improper fraction
mixed number
mixed number

liczba mieszana

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wymowa w języku angielskim: infrasound
proper fraction
proper fraction

ułamek właściwy

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wymowa w języku angielskim: proper fraction
rest from division of natural numbers
rest from division of natural numbers

reszta z dzielenia liczb naturalnych

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wymowa w języku angielskim: rest from division of natural numbers
whole part of the mixed number
whole part of the mixed number

część całkowita liczby mieszanej

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wymowa w języku angielskim: whole part of the mixed number

Keywords

mixed numbermixed numbermixed number

improper fractionimproper fractionimproper fraction

proper fractionproper fractionproper fraction

common fractioncommon fractioncommon fraction

rest from division of natural numbersrest from division of natural numbersrest from division of natural numbers