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ractions - PowerPoint PPT Presentation


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&. dding. ubtracting. ractions. We need a common denominator to add these fractions. +. We need a common denominator to add these fractions. +. Count by 2\'s. 2, 4, 6, 8, 10, 12, 14, 16, 18, 20. Count by 7\'s. 7, 14, 21, 28, 35… . Count by 2\'s. 2, 4, 6, 8, 10, 12, 14, 16, 18, 20.

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Presentation Transcript
slide1

&

dding

ubtracting

ractions

slide2

We need a common

denominator to add

these fractions.

+

slide3

We need a common

denominator to add

these fractions.

+

Count by 2\'s

2, 4, 6, 8, 10, 12, 14, 16, 18, 20

Count by 7\'s

7, 14, 21, 28, 35…

slide4

Count by 2\'s

2, 4, 6, 8, 10, 12, 14, 16, 18, 20

Count by 7\'s

7, 14, 21, 28, 35…

The first number IN COMMON

that appears on both lists

becomes the common denominator

slide5

x 7

7

Make equivalent

fractions.

=

X 7

x 2

6

Add the numerators

=

+

7 + 6 = 13

x 2

13

slide6

We need a common

denominator to add

these fractions.

+

Count by 7\'s

7, 14, 21, 28, 35, 42, 49, 56, 63

Count by 5\'s

5, 10, 15, 20, 25, 30, 35, 40, 45

slide7

x 5

15

Make equivalent

fractions.

=

X 5

x 7

7

+

Add the numerators

=

x 7

15 + 7 = 22

22

slide8

We need a common

denominator to add

these fractions.

+

Count by 7\'s

7, 14, 21, 28, 35, 42, 49, 56, 63

Count by 8\'s

8, 16, 24, 32, 40, 48, 56, 64, 72

slide9

32

x 8

Make equivalent

fractions.

=

x 8

21

Add the numerators

x 7

+

32 + 21 = 53

=

x 7

53

slide10

We need a common

denominator to add

these fractions.

+

Count by 3\'s

3, 6, 9, 12, 15, 18, 21, 24, 27

Count by 5\'s

5, 10, 15, 20, 25, 30, 35, 40, 45

slide11

x 3

9

Add the numerators

=

X 3

9 + 10 = 19

x 5

10

+

=

x 5

19

slide12

We need a common

denominator to add

these fractions.

+

Count by 3\'s

3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33

Count by 11\'s

11, 22, 33, 44, 55, 66, 77…

slide13

15

x 3

Make equivalent

fractions.

=

X 3

x 11

Add the numerators

22

+

=

15 + 22 = 37

x 11

37

slide14

We need a common

denominator to add

these fractions.

+

Count by 3\'s

3, 6, 9, 12, 15, 18, 21, 24, 27

Count by 6\'s

6, 12, 18, 24,…

slide15

4

x 2

=

X 2

Make equivalent

fractions.

1

x 1

+

Add the numerators

=

x 1

4 + 1 = 5

5

slide16

We need a common

denominator to add

these fractions.

+

Count by 11\'s

11, 22, 33, 44, 55, 66, 77…

6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72

slide17

x 6

18

Make equivalent

fractions.

=

X 6

x 11

11

+

Add the numerators.

=

18 + 11 = 29

x 11

29

slide18

We need a common

denominator to add

these fractions.

+

slide19

We need a common

denominator to add

these fractions.

+

Count by 5\'s

5, 10, 15, 20, 25, 30, 35, 40, 45

Count by 9\'s

9, 18, 27, 36, 45, 54, 63, 72, 81

slide20

Count by 5\'s

5, 10, 15, 20, 25, 30, 35, 40, 45

Count by 9\'s

9, 18, 27, 36, 45, 54, 63, 72, 81

The first number IN COMMON

that appears on both lists

becomes the common denominator

slide21

x 9

36

Make equivalent

fractions.

Make equivalent

fractions.

=

x9

x 5

35

Add the numerators.

Add the numerators.

+

=

36 + 35 = 71

36 + 35 = 71

x 5

71

slide22

We need a common

denominator to add

these fractions.

+

Count by 12\'s

12, 24, 36, 48, 60, 72, 84, 96

Count by 8\'s

8, 16, 24, 32, 40, 48, 56, 64, 72, 79, 80, 88, 96

slide23

10

x 2

Make equivalent

fractions.

=

x 2

9

x 3

Add the numerators.

+

=

10 + 9 = 19

x 3

19

slide24

We need a common

denominator to

subtract a fraction

from another.

-

Count by 5\'s

5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55

Count by 11\'s

11, 22, 33, 44, 55, 66, 77…

slide25

15

x 5

Make equivalent

fractions.

=

x 5

11

x 11

Subtract.

=

15 - 11 = 4

-

x 11

4

slide26

We need a common

denominator to

subtract one fraction

from another.

-

Count by 2\'s

2, 4, 6, 8, 10, 12, 14, 16, 18, 20 …

Count by 10\'s

10, 20, 30…

slide27

5

x 5

Make equivalent

fractions.

=

x 5

3

x 1

Subtract.

-

=

5 – 3 = 2

x 1

2

try these
Try These

A

D

E

B

F

C

answers on next slide
Answers On Next Slide
  • Each click on the next slide reveals an answer.
  • Check your papers.
  • If you discover an incorrect answer, be able to explain your mistake.
try these1

17

27

19

20

10

9

41

28

26

21

13

12

Try These

A

D

B

E

C

F