Grades 3 & 4

Reading and interpreting line graphs  

A line graph uses a line with respect to a horizontal and a vertical axis to show the data in the graph. The best use of a line graph is to show data that changes continuously over a period of time. For example, data such as temperature, profit, sales etc. are best shown using a line graph since all these change with respect to time.
 
For example: The line graph below shows the rainfall during the first 9 days of a month.
 
 
In a line graph there are two axis - a horizontal axis and a vertical axis. In the above graph, the vertical axis shows the amount of rainfall in mm and the horizontal axis shows the day of the month.
 
From the graph you can clearly see that on the second day of the month the rainfall was 2 mm. Similarly, on the 9th day of the month the rainfall was 6 mm.




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