Introduction to graph class 8

Class 8 1

Introduction to

graphCLASS - VIII

Class 8 2

Step 1: (2013) Ask a question to the class consisting of 45 students: How many siblings do you have?Step 2 : Collect the responses. Suppose the responses are: 6,2,1,3,4,3,2,6,5,6,1,2,3,3,2,3,2,3,2,1,2,4,4,5,2,1,2,3,2,3,2,3,4,

1,4,5,4,5,2,1,3,2,1,2,1.Step 3: Do you find it difficult to identify that which student has given the which one response?Step 4: Now, we will prepare a table in which the responses are mentioned in front of student name.

Activity 1

Class 8 3

S.No.

Student Name

Number of siblings

1. Ramesh 62. Shipra 23. Anuj 14. Ankit 35. Anit 46. Mahima 37. Priya 28. Shikha 69. Reema 510. Sonu 611. Monu 112. Shweta 213. Silpa 314. Renu 315. Ritu 2

S.No.

Student Name

Number of siblings

16. Pooja 317. Shantnu 218. Ekansh 319. Dimple 220. Richa 121. Amit 222. Vinit 423. Sunil 424. Dinesh 525. Yash 226. Ashish 127. Sohan 228. Mohan 329. Rekha 230. Rajesh 3

S.No.

Student Name

Number of siblings

31. Shreya 232. Vani 333. Amita 434. Pankaj 135. Anu 436. Om 537. Jaya 438. Sushm

a5

39. Sunita 240. Neha 141. Atul 342. Akash 243. Alok 144. Vinod 245. Sharda 16,2,1,3,4,3,2,6,5,6,1,2,3,3,2,3,2,3,2,1,2,4,4,

5,2,1,2,3,2,3,2,3,4,1,4,5,4,5,2,1,3,2,1,2,1.

Class 8 4

S.No.

Student Name

Number of siblings


S.No.

Student Name

Number of siblings


S.No.

Student Name

Number of siblings


a5

39. Sunita 240. Neha 141. Atul 342. Akash 243. Alok 144. Vinod 245. Sharda 1What is the no. of student who

have least number of siblings?

Class 8 5

S.No.

Student Name

Number of siblings


S.No.

Student Name

Number of siblings


S.No.

Student Name

Number of siblings


a5


have highest number of siblings?

Class 8 6

S.No.

Student Name

Number of siblings


S.No.

Student Name

Number of siblings


S.No.

Student Name

Number of siblings


a5


have no siblings?

Class 8 7

S.No.

Student Name

Number of siblings


S.No.

Student Name

Number of siblings


S.No.

Student Name

Number of siblings


a5

39. Sunita 240. Neha 141. Atul 342. Akash 243. Alok 144. Vinod 245. Sharda 1How many students have siblings

more than 3 but less than 6?

Class 8 8

Step 5: To prepare a better visual representation proceed as follows:

Contd...

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0

Num

ber o

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s

Number of siblings

Siblings Record 2013

Class 8 9

S.No.

Student Name

Number

of siblings


S.No.

Student Name

Number

of siblings


S.No.

Student Name

Number

of siblings


a5

39. Sunita 240. Neha 141. Atul 342. Akash 243. Alok 144. Vinod 245. Sharda 1

Class 8 10

Contd...

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8

Num

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Number of siblings


Class 8 11

S.No.

Student Name

Number

of siblings


S.No.

Student Name

Number

of siblings


S.No.

Student Name

Number

of siblings


a5


Class 8 12

Contd...

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8

Num

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Number of siblings

14


Class 8 13

S.No.

Student Name

Number

of siblings


S.No.

Student Name

Number

of siblings


S.No.

Student Name

Number

of siblings


a5


Class 8 14

Contd...

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8

Num

ber o

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Number of siblings

14 10


Class 8 15

S.No.

Student Name

Number

of siblings


S.No.

Student Name

Number

of siblings


S.No.

Student Name

Number

of siblings


a5


Class 8 16

Contd...

1 2 3 4 5 6 7

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8

Num

ber o

f stu

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Number of siblings

14 10 6


Class 8 17

S.No.

Student Name

Number

of siblings


S.No.

Student Name

Number

of siblings


S.No.

Student Name

Number

of siblings


a5


Class 8 18

Contd...

1 2 3 4 5 6 7

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8

Num

ber o

f stu

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Number of siblings

14 10 6 4


Class 8 19

S.No.

Student Name

Number

of siblings


S.No.

Student Name

Number

of siblings


S.No.

Student Name

Number

of siblings


a5


Class 8 20

Contd...

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Num

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Number of siblings

14 10 6 4 3


Class 8 21

What is the no. of student who have least number of siblings?Contd...

1 2 3 4 5 6 7

5

10

15

25

30

20

0

8

Num

ber o

f stu

dent

s

Number of siblings

14 10 6 4 3

Ans.


Class 8 22

What is the no. of student who have highest number of siblings?

Contd...

1 2 3 4 5 6 7

5

10

15

25

30

20

0

8

Num

ber o

f stu

dent

s

Number of siblings

14 10 6 4 3

Ans.


Class 8 23

How many students have siblings more than 3 but less than 6?Contd...

1 2 3 4 5 6 7

5

10

15

25

30

20

0

8

Num

ber o

f stu

dent

s

Number of siblings

14 10 6 4 3

6 + 4 = 10

Ans.

Class 8 24

What is the no. of student who have no siblings?Contd...

1 2 3 4 5 6 7

5

10

15

25

30

20

0

8

Num

ber o

f stu

dent

s

Number of siblings

14 10 6 4 3

Ans. = 0Siblings Record 2013

Class 8 25

A bar graph is used to show comparison among categories. It may consist of two or more parallel vertical (or horizontal) bars (rectangles).

Bar Graph

1 2 3 4 5 6 7

5

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25

20

0

8Num

ber o

f stu

dent

s

Number of siblings

14 10 6 4 3

Origin

Bars

X-axis

Y-axisSiblings Record 2013

Class 8 26

Class 8 27

After two year,

Will the number of siblings of students will be same?

Will the highest or lowest no. of siblings be same as before two years?

How will teacher identify the change in no. of siblings of students?

Class 8 28

S.No.

Student Name

Number

of siblings


S.No.

Student Name

Number

of siblings


S.No.

Student Name

Number

of siblings


a5

39. Sunita 340. Neha 141. Atul 342. Akash 243. Alok 144. Vinod 245. Sharda 1No. of siblings 1 2 3 4 5 6 7

No. of students 7 11 14 6 3 3 22015

Class 8 29

1 2 3 4 5 6 7

5

10

15

25

30

20

0

711 14

6 3 3 2

Siblings Record 2015Y-axis

X-axis

Num

ber o

f stu

dent

s

Number of siblings

No. of siblings 1 2 3 4 5 6 7

No. of students 7 11 14 6 3 3 2

Class 8 30

Contd...

1 2 3 4 5 6 7

5

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0

Num

ber o

f stu

dent

s

Number of siblings

78

1114 14

6 6 43 33 2

10

Siblings Record 2013-2015

=

=

2013

2015

Class 8 31

Double bar graph Used to compare the data

Class 8 32

If the no. of siblings increases to 20 then is it easy to plot it on graph paper ?

No. of siblings 0-5 5-10 10-15 15-20

No. of students

18 13 8 5

Class interval

Class 8 33

5 10 15 20

5

10

15

25

30

20

0

1813

8

Siblings Record 2015Y-axis

X-axis

Num

ber o

f stu

dent

s

Number of siblings

No. of siblings 0-5 5-10 10-15 15-20No. of students

18 13 8 20

20

Class 8 34

A Histogram is a bar graph that shows data in intervals. It has adjacent bars over the intervals.

Histogram

Class 8 35

Activity Pie chart

Session-II

Class 8 36

Identify???

Angle

Portion /Part “Pie Slice”Tyre

Class 8 37

Activity Step 1:Ask student about their favorite subject . Step 2: Collect the responses. Suppose responses are:Hindi, Sanskrit, English, Math, Science, Hindi, English Science, Sanskrit, English, Science, Sanskrit, English, Science, Hindi, Sanskrit, Sanskrit, Hindi, English, English Step 4: Put your data into a table (like above), then add up all

the to get a total.

Step 4: Divide each value by the total and multiply by 100 to get a percentage.

Class 8 38

Step 5: Figure out how many degrees for each "pie slice“. A Full Circle has 360 degrees, so we do this calculation.

Step 6:Draw a circle. Then use the protractor to measure the degrees of each sector.

Class 8 39

Example

20%

25%

30%

5%

20%

Favorite SubjectHindi

Sanskrit

English

Math

Science

Class 8 40

Pie Chart A pie chart displays data, information, and statistics in an

easy-to-read 'pie-slice' format with varying slice sizes telling you how much of one data element exists. The bigger the slice, the more of that particular data was gathered.

For example:

20%

25%

30%

5%

20%

Favorite Subject

Hindi Sanskrit

English Math

Science

Class 8 41

Activity Line graph

SESSION-III

Class 8 42

What is this?

What is our normal body temperature?

37°C 98.6° F

=

Thermometer

Class 8 43

Anita fall sick and she went to doctor. Doctor asked her to take medicine and record her body temperature for four days.

Activity

Day 135°C

Day 239°C

Day 336°C

Day 437°C

Class 8 45

She recorded the temperature as follows:

She prepared a graph of the data as follows:

She thought to prepare something different.

No. of days 1 2 3 4Temperature recorded 35°C 39°C 36°C 37°C

Class 8 46

01 2 3 4

20

10

30

40

Tem

pera

ture

reco

rded

( in

°C)

Number of days

. .

No. of days 1 2 3 4Temperature recorded 35°C 39°

C36°C

37°C

. .

Class 8 47

01 2 3 4

20

10

30

40

Tem

pera

ture

reco

rded

( in

°C)

Number of days

. . . .

Line graph

Class 8 48

A line graph displays data that changes continuously over periods of time.

Line graph

If this line is straight then what it would be called?

Class 8 49

What is the position of black mark?

.

Class 8 50

2 3 4 5 60

1-1

-2

-3

-4

-5

-1-2-3-4-5-6

1

X-axis

Y-axis

2

3

4

5

6

(-4,-3)

.(-4,5)

. (5,-4)

. (1,1)

x-coordinate

Coordinates of the point

y-coordinate

Origin

What is its location?

What is its location?What is its location?

.

(0,0)

Class 8 51

I QuadrantII Quadrant

III Quadrant IV Quadrant

..

.

(1,1)

(-4,5)

(-4,-3) (5,-4)

(+,+)(-,+)

(-,-) (+,-)

Class 8 52

THANK YOUPresented by: Monika

Date post:	08-Jan-2017
Category:	Education
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Introduction to graph class 8

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