Answer Questions from Three Category Counts

Supplied materials

• Paper and a pencil; drawing and spoken explanations are welcome. An adult may read directions and options aloud.
• Supplied worked-case record: The supplied votes are apples 6, oranges 4, pears 3.
• All quantities and shape descriptions are supplied in the worked example and questions; no purchase or personal information is needed.

Learn the idea

A category record gives one count for each labeled group. Add counts to find the whole sample. Subtract counts to compare categories. These operations answer different questions, so identify which count the question requests before calculating.

Copy the three supplied category labels and counts. For a total, add all three once. For a comparison, use only the two named categories and subtract the smaller from the larger.

Keep category labels beside their counts. A total uses all categories; a difference uses the two compared categories. Draw one column of tally marks beneath each category label.

1. Draw one column of tally marks beneath each category label.
2. Follow the worked example. Point to each number or shape feature and say what it tells you.
3. Copy the three supplied category labels and counts.
4. Try the question and then the three practice questions. Check your answers and explain any change you make.

Check your reasoning

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Take it further

For counts 7,5,4, find the total and largest-minus-smallest. Expected: 16 and 3.

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