fractions brought to you by powerpointpros.com. what are fractions? a fraction is a part of a whole

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What are fractions? A fraction is a part of a whole.

What are fractions? Think of a fraction like a slice of pizza.

If you eat a slice of pizza, you’re eating only a part

of the whole pizza.

What are fractions? This is a fraction. Look and see that there are two numbers placed on top of each other.

12

__

What are fractions?

12

__The top number is

called the numerator.

The bottom number is called the

denominator.

Making fractions Let’s go back to our pizza example…

This pizza has been divided into 8 equal slices.

That number makes up the denominator of our

fraction. 8__

Making fractions Let’s go back to our pizza example…

One of those 8 slices has been eaten. That number makes up the numerator

of our fraction. 8__1

Making fractions Let’s go back to our pizza example…

So, if we look at this fraction, we can see that one eighth of this pizza

has been eaten. 8__1

Making fractions Let’s try another example…

This pizza has been divided into 4 equal slices, so we make that number the denominator of our

fraction. 4__

Making fractions Let’s try another example…

One of those 4 slices has been eaten, so we make

that number the numerator of our fraction. 4

__1

Making fractions Let’s try another example…

So, if we look at this fraction, we can see that one fourth of this pizza

has been eaten. 4__1

Making fractions So, as we can see, the denominator of a fraction stands for how many total pieces the pizza has been divided into… … and the numerator of a fraction stands for how many pieces have been eaten.

Let’s Practice!Make a fraction that shows how much of the pizza has been eaten.

Let’s Practice! (1)

XXMake a fraction that shows how much of the pizza has been eaten.

8__2First, find out how many slices

there are total.(denominator)

Then, find out how many slices have been eaten.

(numerator)

Let’s Practice! (1)

XX8

__2Two eighths of the pizza have been eaten!

Let’s Practice! (2)

XMake a fraction that shows how much of the pizza has been eaten.

4__1First, find out how many slices

there are total.(denominator)

Then, find out how many slices have been eaten.

(numerator)

Let’s Practice! (2)

4__1One fourth of the

pizza has been eaten!

X

Let’s Practice! (3)

XXMake a fraction that shows how much of the pizza has been eaten.

6__5First, find out how many slices

there are total.(denominator)

Then, find out how many slices have been eaten.

(numerator)

XXX

Let’s Practice! (3)

6__5Five sixths of the

pizza have been eaten!

XXXXX

Let’s Practice! (4)

Make a fraction that shows how much of the pizza has been eaten.

2__1First, find out how many slices

there are total.(denominator)

Then, find out how many slices have been eaten.

(numerator)

X

Let’s Practice! (4)

2__1One half of the

pizza has been eaten!X

Let’s Practice! (5)

Make a fraction that shows how much of the pizza has been eaten.

3__2First, find out how many slices

there are total.(denominator)

Then, find out how many slices have been eaten.

(numerator)

XX

Let’s Practice! (5)

3__2Two thirds of the

pizza have been eaten!

XX

Reading fractionsYou’ve done a good job making fractions based on examples, but what about reading fractions?

If we look at this fraction, what does it actually mean?

4__2

Reading fractions If we go back to our pizza example, it will help us understand what this fraction means.

4__2

Reading fractions Recall that the denominator of a fraction stands for how many total pieces the pizza has been divided into… …and the numerator of a fraction stands for how many pieces have been eaten.

4__2

Reading fractionsUsing that information, we can make another pizza example to show what this fraction means.

4__2

Reading fractionsWe just said that the denominator, or bottom number, of a fraction shows how many pieces the pizza has been cut into. 4

__2

Reading fractionsThe bottom number of this fraction is 4, so that means we have to cut this pizza into 4 equal slices! 4

__2

Reading fractionsWe also said that the numerator, or top number, of a fraction tells us how many of those pieces have been eaten. 4

__2

Reading fractionsThe top number of this fraction is 2, so that means that 2 of the 4 slices have been eaten!

4__2XX

Reading fractionsWe’ve just figured out what this fraction means! It means that…The pizza has been cut into 4 slices……and 2 of those slices have been eaten!We just read a fraction!Let’s try another one!

4__2XX

Reading fractionsLet’s use a new fraction this time…

What does this fraction mean? 8__5

Reading fractionsWe know that the denominator tells us how many pieces the pizza should be cut into.This fraction has a denominator of 8, so this pizza should be cut into 8 equal slices!

8__5

Reading fractionsWe also know that the numerator tells us how many pieces have been eaten.This fraction has a numerator of 5, which means that 5 of these pieces have been eaten!

8__5X X

XXX

Reading fractionsWe’ve now know what this fraction means! It means that…The pizza has been cut into 8 slices……and 5 of those slices have been eaten!We just read another fraction!

8__5X X

XXX

Let’s Practice!Find out what each fraction means using pizzas.

Let’s Practice! (6)

4__1

Find out what each fraction means using pizzas.

First, we have to divide the pizza into the number of slices shown in

the denominator.

Then, we have to figure out how many slices have been eaten, which

is shown in the numerator.

X

Let’s Practice! (6)

4__1

Find out what each fraction means using pizzas.

We’ve figured out what this fraction means! It means that…

This pizza has been divided into 4 slices…

…and 1 of those 4 slices has been eaten.

X

XX

Let’s Practice! (7)

6__2

Find out what each fraction means using pizzas.

First, we have to divide the pizza into the number of slices shown in

the denominator.

Then, we have to figure out how many slices have been eaten, which

is shown in the numerator.

Let’s Practice! (7)

6__2

Find out what each fraction means using pizzas.

We’ve figured out what this fraction means! It means that…

This pizza has been divided into 6 slices…

…and 2 of those 6 slices have been eaten.

XX

Let’s Practice! (8)

4__3

Find out what each fraction means using pizzas.

First, we have to divide the pizza into the number of slices shown in

the denominator.

Then, we have to figure out how many slices have been eaten, which

is shown in the numerator.

X XX

Let’s Practice! (8)

4__3

Find out what each fraction means using pizzas.

We’ve figured out what this fraction means! It means that…

This pizza has been divided into 4 slices…

…and 3 of those 4 slices have been eaten.

X XX

X

Let’s Practice! (9)

8__7

Find out what each fraction means using pizzas.

First, we have to divide the pizza into the number of slices shown in

the denominator.

Then, we have to figure out how many slices have been eaten, which

is shown in the numerator.

XXXXX

X

Let’s Practice! (9)

8__7

Find out what each fraction means using pizzas.

We’ve figured out what this fraction means! It means that…

This pizza has been divided into 8 slices…

…and 7 of those 8 slices have been eaten.

X XXXX

XX

Short ReviewA fraction is part of a whole.

The top number in a fraction is called the numerator.

The bottom number in a fraction is called the denominator.

Great job! You now know about fractions!