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DIVISION OF FRACTIONS - PowerPoint PPT Presentation


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DIVISION OF FRACTIONS. Means. ?. How many . can cover. Lesson Objectives: . To understand concept of division of fractions. To learn how to divide fractions. To Divide Fractions Just F LIP IT!!!. DOUBLE CLICK TO START THEN ONE MORE CLICK WHEN 
LETTERING APPEARS.

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Presentation Transcript
slide4

DIVISION OF FRACTIONS

Means

?

How many

can cover

slide5

Lesson Objectives:

To understand concept of division of fractions

To learn how to divide fractions

slide6

To Divide Fractions

Just

FLIP IT!!!

DOUBLE CLICK TO START THEN ONE MORE CLICK WHEN 
LETTERING APPEARS

Video provided by:http://www.teachertube.com/members/
viewVideo.php?
video_id=81294&title=Math_Rocks__Dividing_Fractions_FLIP_IT

slide8

1

2

1

4

=

A division equation asks the question........

1

2

1

4

?

How many

's

in

Move the 1/4 fraction strip to see how 

many it takes to cover the 1/2 bar.

1/2

1/4

1/4

1/4

slide9

HOW MANY 1/4'S ARE IN ONE-HALF?

1

2

1

4

=

2

To divide by a fraction, multiply by its reciprocal.

Exchanging the numerator and denominator of a fraction forms its reciprocal

4

2

=

1

2

4

1

=

X

2

There are2 fourths in one-half.

1/2

1/4

1/4

slide10

HOW MANY 1/8'S ARE IN ONE-HALF?

1

2

1

8

=

?

Multiply by the reciprocal of the divisor.

8

2

1

2

8

1

=

=

X

4

?

There are____ eighths in one-half.

1/8

1/2

slide11

HOW MANY 1/8'S ARE IN THREE-FOURTHS?

3

4

1

8

=

?

Multiply by the reciprocal of the divisor.

24

4

=

?

3

4

8

1

=

X

6

There areeighths in three-fourths.

1/8

1/4

1/4

1/4

slide12

HOW MANY 3/16'S ARE IN THREE-FOURTHS?

3

16

3

4

=

?

Multiply by the reciprocal of the divisor.

48

12

=

3

4

16

3

=

X

?

4

There are 3/16 in three-fourths.

1/4

1/4

1/4

1/16

1/16

1/16

slide13

REMEMBER!!!

When a whole number 
is in the problem, you 
must make it the 
numerator and a 1 
becomes the 
denominator!!!

Pull tab for examples!

slide14

To divide by a fraction, multiply by its reciprocal.

Exchanging the numerator and denominator of a fraction forms its reciprocal

You don't believe this little trick?

Let me prove it to you!

4

=

2

is the same as

4 x

1

2

=

Try another one - use any numbers - it always works!

slide15

A piece of pie is better than no pie at all!

Dividing Fractions

Multiply by the reciprocal

(Invert the divisor and multiply)

1.) 

2

3

2

=

http://exchange.smarttech.com/search.html?q=dividing+fractions

slide16

Fraction Bars

1

1/8

1/4

1/16

1/2

slide17

A piece of pie is better than no pie at all!

Dividing Fractions

Multiply by the reciprocal

(Invert the divisor and multiply)

1.) 7 1

8 6

=

http://exchange.smarttech.com/search.html?q=dividing+fractions

slide18

A piece of pie is better than no pie at all!

Dividing Fractions

Multiply by the reciprocal

(Invert the divisor and multiply)

1.) 3 1

7 4

=

http://exchange.smarttech.com/search.html?q=dividing+fractions

slide19

A piece of pie is better than no pie at all!

Dividing Fractions

Multiply by the reciprocal

(Invert the divisor and multiply)

1.) 1 5

2 6

=

http://exchange.smarttech.com/search.html?q=dividing+fractions

slide22

"the flip of a fraction"

reciprocal of

reciprocal of 3 =

slide24

practice 5-9

Grade:

«grade»

«subject»

Subject:

«date»

Date:

slide42

3

Problems to solve:

2

Things you learned.

1

Question you still have.

slide43

Attachments

05-09.ppt