Fractions

Fractions
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Slide 1: Tekstslide
MathematicsPrimary Education

In deze les zitten 34 slides, met interactieve quizzen en tekstslides.

time-iconLesduur is: 60 min

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Fractions

Slide 1 - Tekstslide

How do you feel about fractions?
๐Ÿ˜’๐Ÿ™๐Ÿ˜๐Ÿ™‚๐Ÿ˜ƒ

Slide 2 - Poll

Fraction
  • Do you know any words in English that start with fract-?
  • Fracture
  • What is a fracture?

Slide 3 - Tekstslide

Slide 4 - Tekstslide

A fraction is...
  • A whole divided into equal parts
  • The parts must be equal
  • English words for fractions are usually the number + -th
  • For example sixth, tenth, hundredth, thousandth
  • Irregular words are half, third, quarter. 

Slide 5 - Tekstslide

Slide 6 - Tekstslide

Slide 7 - Tekstslide

Slide 8 - Tekstslide

Names of fractions
Let's practice naming fractions. 

Slide 9 - Tekstslide

Slide 10 - Link

Unit fractions
Unit fractions include

  • The top number (1) is called the numerator.
  • This tells us how many parts there are.
  • The bottom number is the denominator.
  • This is the total number of equal parts.  
  • What word can you see in denominator?
  • Nominate - what does this word mean?
  • The line between the numerator and denominator means divide. 




โ€‹2โ€‹โ€‹1โ€‹โ€‹
โ€‹3โ€‹โ€‹1โ€‹โ€‹
โ€‹4โ€‹โ€‹1โ€‹โ€‹

Slide 11 - Tekstslide

Half
This means 1 divided by 2.

โ€‹2โ€‹โ€‹1โ€‹โ€‹

Slide 12 - Tekstslide

Fractions
  • This KitKat has been divided into 4 equal parts.
  • Each part is therefore 1/4. 
  • Or a quarter. 
  • How could you divide the KitKat into 8 equal parts?
  • Which is bigger: 1/4 or an 1/8?

Slide 13 - Tekstslide

Key fact
  • The bigger the denominator the smaller the fraction.
  • 1/3 is smaller that 1/2
  • 1/3 is bigger than 1/4
  • 1/5 is bigger than 1/10

Slide 14 - Tekstslide

Which is bigger?

A
1/2
B
1/8

Slide 15 - Quizvraag

Which is bigger?
A
1/2
B
1/4

Slide 16 - Quizvraag

Which is bigger?
A
1/16
B
1/4

Slide 17 - Quizvraag

Which is bigger?
A
1/64
B
1/4

Slide 18 - Quizvraag

Which is bigger?
A
1/8
B
1/4

Slide 19 - Quizvraag

Which is bigger?
A
1/8
B
1/16

Slide 20 - Quizvraag

How are you feeling about fractions so far?
๐Ÿ˜’๐Ÿ™๐Ÿ˜๐Ÿ™‚๐Ÿ˜ƒ

Slide 21 - Poll

Equivalent fractions and simplifying fractions
  • Simplifying fractions is reducing fractions to their simplest form.
  • To do this we look at the numerator (the top number) and the denominator (the bottom number) and find a common factor that we can use to cancel the fraction down to its lowest terms. The numerator and denominator are always whole numbers
  • For example, the fraction 5/10  can be simplified to 1/2  as both the numerator and denominator have 5 as a factor.

Slide 22 - Tekstslide

Divisibility facts
  • These facts can help to identify common factors. 
  • We must divide the numerator and denominator by the same number

Slide 23 - Tekstslide

Even numbers can be divided by 2. They end in 2, 4, 6, 8 and 0. Write some even numbers below.

Slide 24 - Open vraag

Slide 25 - Link

Numbers that end in 5 or 0 can be divided by 5. List some of these below.

Slide 26 - Open vraag

Slide 27 - Link

Numbers can be divided by 3 if...
  • The sum of their digits adds up to 3, 6 or 9
  • For example, 21 can be divided by 3 because 2 +1= 3
  • 402 can be divided by 3 because 4+0+2= 6
  • 432 can be divided by 3 because 4+3+2= 9

Slide 28 - Tekstslide

List some numbers that can be divided by 3 below.

Slide 29 - Open vraag

Slide 30 - Link

Numbers can be divided by 6 if...
  • The sum of their digits adds up to 3, 6 or 9 
  • AND
  • If they are even
  • So 432 can be divided by 6
  • 504 can be divided by 6

Slide 31 - Tekstslide

Think of a number that can be divided by 6.

Slide 32 - Open vraag

Slide 33 - Link

Numbers can divide by 9 if...

Slide 34 - Tekstslide