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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