seegongsik
Grade 3 (age 8-9)

grade 3 Bar Graph

A bar graph draws survey counts as the length of each bar. The longer the bar, the bigger the number, so the most and the least stand out at a glance. A favorite-fruit survey is the same idea as class data: the table keeps the exact counts, and the graph is where you compare them quickly. Move the slider for each fruit and the bars change height, while the table updates the biggest count and the total.

Showing data in a graph

📊 What is a bar graph?
①A bar graph shows survey counts as the lengths of bars
②Comparing bar lengths lets you compare amounts at a glance
③The number on top of each bar is how many students chose that fruit
④The longest bar is the fruit chosen most

Making a bar graph

8
5
12
7
3

Organizing in a table and reading it

🔍 What the table and graph tell you
①The table gives the exact number of students for each fruit
②Under the table are the most chosen fruit, the least chosen fruit, and the total
③Misreading the scale on the vertical axis gives the wrong numbers
④Without a title and axis labels, nobody can tell what the bars stand for

Wrap-up

How to draw a bar graph
① horizontal axis (categories) ② vertical axis (amounts) ③ draw the bars
Make each bar as tall as its count
Reading a graph
taller bar = larger amount
The height of a bar shows the size of the data
Tables and graphs
table: exact numbers / graph: quick comparison
A table shows exact numbers; a graph makes comparing quick
🎯 Remember
①A bar graph shows data as bar lengths
②Read the scale on the vertical axis carefully
③The longest bar is the largest category
④Using a table and a graph together gives you both exact numbers and a quick comparison
⑤Always give a graph a title and axis labels

Examples and unit check

Example 1
In a favorite fruit survey, 8 students chose apple, 5 banana, 12 grape, 7 strawberry, and 3 tangerine. How many students were surveyed in all?
1
Add up the students for every fruit. These are the same as the starting values of the sliders above.
2
8 + 5 + 12 + 7 + 3 = 35 students.
▸ 35 students
The total number of students is the sum of all the bar values.
Example 2
In the survey above, what is the difference between the most and least chosen fruit?
1
The most chosen is grape with 12 students, and the least is tangerine with 3.
2
The difference is 12 − 3 = 9 students.
▸ 9 students
Compare the longest bar with the shortest bar to find the difference.
Unit check
In a bar graph, what does the longest bar stand for?
①The category with the fewest
②The category with the most
③The total
④The average
▸ ② The category with the most
1
In a bar graph, a longer bar means a larger amount.
2
So the longest bar stands for the category with the most.
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Finding Patterns
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Large Numbers

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