Year 9 student introduction to bar graphs

1. Skills in Social
Studies
The Bar Graph

2. Key Features of a Bar Graph
A Bar Graph must have the following:
• A Title
• Both axis ruled
• Clearly labelled unit of measurement on
both axis
• Equal spacing on both axis
• Numbers increasing at regular intervals

3. Bar Graph of Rainfall in Darwin
Rainfall for Darwin, Australia
400
360
0
40
80
120
160
200
240
280
320
Rainfall(mm)
DNOSJ AJMAMFJ
Months
Month Rainfall
Jan 380mm
Feb 315mm
Mar 260mm
Apr 100mm
May 30mm
June 10mm
July 0mm
Aug 20mm
Sep 40mm
Oct 60mm
Nov 130mm
Dec 245mm

4. Create your own Bar Graph
• Use these figures to create your
own bar graph.
• Remember the Key Features of a
Bar Graph.
• Hint: Decide on vertical axis
spacing now.
• Try to make you graph as
accurate as possible
• Complete graph and then put
your hand up so I can check your
graph.
Year Road Deaths in NZ
1990 729
1992 646
1994 580
1996 514
1998 501
2000 462
2002 405
2004 435
2006 387

5. Road Deaths in New Zealand
Road Deaths in New Zealand
0
100
200
300
400
500
600
700
800
1990 1992 1994 1996 1998 2000 2002 2004 2006
Year
NumberofDeaths

6. Road Deaths in New Zealand
• Now you have completed your graph I
want you to write 2-3 sentences describing
what your graph is showing.
• e.g. The above graph is showing . . .

7. Road Deaths in New Zealand
• Now answer these questions about your
completed graph.
• Between which years was the biggest drop
in deaths? (How much?)
• Between which years was the lowest drop
in deaths? (How much?)
• Between which years was there an
increase in deaths? (How much?)

8. Road Deaths in New Zealand
• ANSWERS:
• Between which years was the biggest drop
in deaths? (How much?)
• Between which years was the lowest drop
in deaths? (How much?)
• Between which years was there an
increase in deaths? (How much?)
1990-1992 83 people
1996-1998 13 people
2002-2004 30 people