🔢 MathGrade 2Lesson 33
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Create Bar Graphs and Tally Charts
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Learning Objectives
- 1Use tally marks to record data, grouping every fifth mark
- 2Read a tally chart
- 3State the total for each category
- 4Read a bar graph to find which category has the most or fewest responses
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Mini Lesson
When we collect information about a group of things, we call it data. Two great ways to organize and show data are tally charts and bar graphs.
Tally marks
- Each tally mark stands for 1 item.
- After 4 marks, draw the 5th mark across the group — this makes a bundle of 5 that is easy to count quickly.
- To find the total, count the bundles of 5 first, then add the extras.
- Example: 4 marks crossed + 2 extras = 5 + 2 = 7.
Tally charts
- A tally chart has a category column (what you are counting) and a tally column (the marks).
- You can also add a total column to write the number.
- Ask a survey question and add one tally mark for each answer you hear.
Bar graphs
- A bar graph uses bars to show how many are in each category.
- The taller the bar, the more items in that category.
- Always check the title and the labels on the axes before reading.
- Compare bars to answer questions like "Which is most?" or "How many more?"
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Ask yourself: "What is the title? Which axis shows the numbers? Which bar is tallest — and which is shortest?"
Vocabulary
Data
Information that has been collectede.g. We collected data about favorite fruits.
Tally mark
A line that stands for one iteme.g. Each tally mark counts as one vote.
Tally chart
A chart with categories and tally markse.g. I made a tally chart of pets on our street.
Bar graph
A graph that uses bars to show how manye.g. The tallest bar on the bar graph showed dogs.
Category
A group of things that are alikee.g. Each fruit was its own category.
Total
The full count for a categorye.g. The total for dogs was 7.
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