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Grade 4 (age 9-10)

Line Graph

Line Graph

A line graph plots values that change over time as points and connects them with lines. When the line rises the value grows, and when it falls it shrinks; the steeper the slope, the bigger the change. It is perfect for seeing change at a glance, like monthly temperatures. Here you can adjust the temperature from March to September and build your own line graph.

What is a line graph?
📈 See change at a glance!
①Connect points to show change over time
②Line up = increase, line down = decrease
③Steeper slope = bigger change!
Build a temperature graph
8°C
14°C
19°C
24°C
27°C
26°C
22°C
Reading the Graph
🔍 What you can read from a line graph
①Highest point = hottest month
②Lowest point = coldest month
③Steep upward = sharp temperature rise
④Downward slope = temperature falling
Summary
Line Graph
A graph connecting time-series data points with lines
See the trend of change at a glance
Bar vs. Line Graph
Bar: size comparison / Line: trend of change
Pick the right graph for the purpose
Meaning of Slope
Steep slope = fast change, gentle slope = slow change
Tilt of the line shows the speed of change
🎯 Key Points
①A line graph shows change
②Set time on x-axis, quantity on y-axis
③Plot points and connect with lines
④Upward = increase, downward = decrease
⑤Choose tick interval carefully for accuracy!
Examples and Unit Test
Example 1
On a monthly-temperature line graph, what does the highest point mean?
1
On a line graph, the height of a point shows that month's temperature.
2
The highest point means the month with the highest temperature, the hottest month.
▸ The hottest month (highest temperature)
On a line graph, the higher the point, the greater the value.
Example 2
On a line graph, what does it mean when the line goes up to the right?
1
An upward line means the value is rising; a downward line means it is falling.
2
So an upward segment is a time when the temperature is increasing (rising).
▸ The value is increasing (rising)
A steeper line means a bigger change; a gentler line, a smaller change.
Unit Test
Which graph is best for showing the trend of change over time?
①bar graph
②line graph
③pictograph
④a table
▸ ② line graph
1
Bar graphs compare sizes; line graphs show the trend of change.
2
To see change over time, a line graph is the most suitable.
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