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Session 5 of 8 · Grade 3 Data Science
📊

Pictures That Tell Stories

Turning your frequency table into a chart
~60 minutes Grade 3 · Ages 8–9 Data Cycle: Visualize
Today's Plan

What We'll Do Today

The Big Idea: A chart is a table turned into a picture. The numbers stay the same — but your eyes can spot the pattern instantly.
Warm-Up · 5 min

From Table to Picture

Look at your frequency table from Session 4.
What did you notice?
What you already have
A clean frequency table with categories and counts
A most popular answer and a least popular answer
A total that you verified
What we'll add today
Turn those numbers into a visual chart
Make the pattern visible without counting
Learn the rules so charts are honest and clear
Lesson 1

Why Do We Use Charts?

📋 Table
Exact numbers
Good for precise comparisons
Harder to see patterns quickly
Best for detailed reference
📊 Chart
Visual pattern — instant!
Easy to see biggest/smallest
Great for sharing with others
Makes data memorable
Data scientists use BOTH — tables for accuracy, charts for communication.
Lesson 1

Parts of a Bar Chart

📌 Title
Favorite Seasons in Our Class
86420
7
5
6
4
Summer
Fall
Winter
Spring
↕ Number Axis (scale) ↔ Category Axis (labels) █ Bars (height = frequency)
Lesson 1 — Scale

The Scale Must Be Even

❌ Uneven scale — misleading!
0 → 1 → 3 → 7 → 8
The gaps are not equal
Bars look wrong — hard to compare
Can accidentally mislead the reader
✅ Even scale — honest!
0 → 2 → 4 → 6 → 8
Every step is the same size (+2)
Bars accurately show the differences
Reader can trust the comparison
Rule: Pick a scale that fits your highest number. If your highest frequency is 8, use 0–2–4–6–8 or 0–1–2–3–4–5–6–7–8.
Activity · 20 min

🎮 Floor Bar Chart!

We're going to BE the bar chart

The teacher will ask a question with 4 answer choices
Write YOUR answer on a sticky note
Place your sticky note in your column — stack from the bottom up!
Step back and look — you just built a life-size bar chart!
After building — discuss:
Which column (bar) is tallest? What does that mean?
Which is shortest?
What would the title of this chart be?
What numbers would go on the scale?
Lesson 3

Pictographs — Charts with Symbols

A pictograph uses a picture or symbol to represent data. Each symbol stands for a certain number — shown in the key.
Favorite Fruit — Our Class
Apple🍎🍎🍎
Banana🍌🍌🍌🍌🍌🍌🍌🍌
Orange🍊🍊🍊🍊🍊
Grape🍇🍇🍇🍇
Key: each symbol = 1 person
When to use
Fun, engaging topics
Smaller numbers
Young audiences
Watch out for
Must include a key!
Symbols must be same size
Half-symbols for odd numbers
Brain Break · 2 min
📏

Be a Bar!

Stand up straight. The teacher calls a number (1–8).

Crouch down or stretch up to show that number as a bar height!

1 = squat all the way down · 8 = stretch as tall as you can

Try a few numbers, then have students call out what number their bar shows!
Lesson 4

How to Choose Your Scale

1
Find the highest frequency in your table
2
Round up to the next easy number (e.g., 9 → round up to 10)
3
Decide on equal steps: count by 1s, 2s, or 5s depending on your highest number
4
Always start at 0
5
Draw and label the axis before drawing any bars
Highest = 5
Scale: 0, 1, 2, 3, 4, 5
Count by 1s
Highest = 12
Scale: 0, 2, 4, 6, 8, 10, 12
Count by 2s
Highest = 25
Scale: 0, 5, 10, 15, 20, 25
Count by 5s
Lesson 4

Which Chart Should I Use?

📊 Bar Chart
Comparing categories
Numbers can be large
Quick, professional look
Easy to add a precise scale
Best for: most class surveys!
🖼️ Pictograph
Fun, engaging display
Works best with small numbers
Symbol matches the topic
Needs a clear key
Best for: posters, displays, sharing with younger kids
Both are correct! A data scientist picks the chart that communicates most clearly for the audience.
Activity · 6 min

✍️ Draw YOUR Chart

Use your Session 4 frequency table

Choose: bar chart OR pictograph
Open your worksheet to Part 5
Follow the checklist on your worksheet
1
Write a title at the top
2
Draw and label your axes (or rows for pictograph)
3
Choose and mark your scale (bar chart) OR key (pictograph)
4
Draw each bar/symbols to match your frequency
5
Color and check — does it match your table?
Self-Check

Does Your Chart Have Everything?

Bar Chart Checklist
☐ Title at the top
☐ Category labels on one axis
☐ Numbers (even scale) on other axis
☐ Scale starts at 0
☐ Each bar height matches frequency
☐ Bars are same width
Pictograph Checklist
☐ Title at the top
☐ Category labels on the left
☐ Each row has correct number of symbols
☐ All symbols are same size
☐ Key explains what 1 symbol = how many people
☐ Symbols match the topic (optional but fun!)
Vocabulary Check

Today's Key Words

Bar chart
Uses bars of different lengths to show frequency
Pictograph
Uses pictures or symbols to represent data
Axis
The horizontal or vertical line that forms the frame of a chart
Scale
The evenly-spaced numbering system on an axis
Title
The label telling what the chart is about
Key / Legend
Guide showing what each symbol means in a pictograph
Session 5 Wrap-Up
🎉

You Made a Chart!

Table → Chart → (next: Read other charts!)
What you did today
Learned the parts of a bar chart
Built a life-size floor bar chart together
Learned what a pictograph is and when to use it
Drew your own chart from your survey data
Coming up in Session 6
Reading charts made by OTHER people
Spotting patterns and trends
Answering questions from a chart
The difference between observing and inferring
Data Science for Young Minds · Grade 3 · sdabagh.github.io/learn/data-science