# Fractions

Fractions
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Slide 1: Slide
MathematicsPrimary Education

This lesson contains 34 slides, with interactive quizzes and text slides.

Lesson duration is: 60 min

## Items in this lesson

Fractions

#### Slide 1 -Slide

How do you feel about fractions?
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#### Slide 2 -Poll

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

#### Slide 4 -Slide

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 8 -Slide

Names of fractions
Let's practice naming fractions.

#### Slide 9 -Slide

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 -Slide

Half
This means 1 divided by 2.

โ2โโ1โโ

#### Slide 12 -Slide

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 -Slide

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

Which is bigger?

A
1/2
B
1/8

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

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

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

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

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

#### Slide 20 -Quiz

How are you feeling about fractions so far?
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#### 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 -Slide

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

#### Slide 23 -Slide

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

#### Slide 24 -Open question

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

#### Slide 26 -Open question

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 -Slide

List some numbers that can be divided by 3 below.

#### Slide 29 -Open question

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 -Slide

Think of a number that can be divided by 6.