DIVISION OF FRACTIONS

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# DIVISION OF FRACTIONS - PowerPoint PPT Presentation

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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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

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

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

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

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

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

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

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!

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!

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

Fraction Bars

1

1/8

1/4

1/16

1/2

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

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

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

"the flip of a fraction"

reciprocal of

reciprocal of 3 =

practice 5-9

«subject»

Subject:

«date»

Date:

3

Problems to solve:

2

Things you learned.

1

Question you still have.

Attachments

05-09.ppt