Fractions BROUGHT TO YOU BY POWERPOINTPROS.COM. What are fractions? A fraction is a part of a whole.
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Transcript of Fractions BROUGHT TO YOU BY POWERPOINTPROS.COM. What are fractions? A fraction is a part of a whole.
FractionsBROUGHT TO YOU BY POWERPOINTPROS.COM
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!