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&. dding. ubtracting. ractions. Adding & Subtracting Fractions Teacher Notes:. Use this presentation to teach the steps for adding and subtracting fractions with unlike denominators. It is assumed that students have a thorough understanding of the process for making equivalent fractions.

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slide1

&

dding

ubtracting

ractions

adding subtracting fractions teacher notes
Adding & Subtracting FractionsTeacher Notes:
  • Use this presentation to teach the steps for adding and subtracting fractions with unlike denominators.
  • It is assumed that students have a thorough understanding of the process for making equivalent fractions.
  • CLICK HERE to view a demonstration with opportunities for students to practice making equivalent fractions.
slide3

We need a common

denominator to add

these fractions.

+

slide4

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…

slide5

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

slide6

x 7

7

Make equivalent

fractions.

=

X 7

x 2

6

Add the numerators

=

+

7 + 6 = 13

x 2

13

slide7

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

slide8

x 5

15

Make equivalent

fractions.

=

X 5

x 7

7

+

Add the numerators

=

x 7

15 + 7 = 22

22

slide9

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

slide10

32

x 8

Make equivalent

fractions.

=

x 8

21

Add the numerators

x 7

+

32 + 21 = 53

=

x 7

53

slide11

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

slide12

x 3

9

Add the numerators

=

X 3

9 + 10 = 19

x 5

10

+

=

x 5

19

slide13

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…

slide14

15

x 3

Make equivalent

fractions.

=

X 3

x 11

Add the numerators

22

+

=

15 + 22 = 37

x 11

37

slide15

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,…

slide16

4

x 2

=

X 2

Make equivalent

fractions.

1

x 1

+

Add the numerators

=

x 1

4 + 1 = 5

5

slide17

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

slide18

x 6

18

Make equivalent

fractions.

=

X 6

x 11

11

+

Add the numerators.

=

18 + 11 = 29

x 11

29

slide19

We need a common

denominator to add

these fractions.

+

slide20

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

slide21

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

slide22

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

slide23

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

slide24

10

x 2

Make equivalent

fractions.

=

x 2

9

x 3

Add the numerators.

+

=

10 + 9 = 19

x 3

19

slide25

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…

slide26

15

x 5

Make equivalent

fractions.

=

x 5

11

x 11

Subtract.

=

15 - 11 = 4

-

x 11

4

slide27

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…

slide28

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