seegongsik
Saved words
Grade 3 (age 8-9)

grade 3 Bar Graph

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.

Show Data as Graphs

📊 What is a Bar Graph?
①Bar lengths represent the data values
②Compare sizes at a glance
③Longest bar = most!

Build a Bar Graph

8
5
12
7
3

Tabulate & Analyze

🔍 What You Can Read
①See which item is most at a glance
②Compare bar lengths. A misread y-axis tick gives the wrong number
③Sum total can also be calculated
④Without a title and axis names you cannot tell what the bars mean

Summary

How to Draw
①X-axis (items) ②Y-axis (count) ③Draw bars
Match bar heights to the survey numbers
Reading a Graph
Taller bar = more
Bar height represents the data size
Table vs Graph
Table: exact / Graph: at a glance
Tables and graphs have different strengths
🎯 Key Points
①Bar graph shows data by bar length
②Read y-axis ticks accurately
③Longest bar = most
④Table + graph = complete data summary
⑤Always include title and axis labels

Examples and Unit Test

Example 1
In a favorite-fruit survey: apple 8, banana 5, grape 12, strawberry 7, tangerine 3. How many students were surveyed in all?
1
Add the number of students for each fruit. These are the slider defaults above.
2
8 + 5 + 12 + 7 + 3 = 35 students.
▸ 35 students
The total is the sum of all the bar values on the graph.
Example 2
In the survey above, what is the difference between the most and least chosen fruit?
1
The most is grape with 12, the least is tangerine with 3.
2
The difference is 12 − 3 = 9.
▸ 9 students
Comparing the longest and shortest bars gives the difference.
Unit Test
On a bar graph, what does the longest bar mean?
①the least item
②the most item
③the total
④the average
▸ ② the most item
1
On a bar graph, a longer bar means a greater count.
2
So the longest bar means the item with the most.
← Previous
Finding Patterns
Next →
Large Numbers