Calculating the Mean
Calculate and interpret the mean as an average of a data set
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1858 concepts · 9 subjects
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Calculating the Mean means practising the idea at the table with counters or paper models and one clear check. We will demo once, then your child tries.
Materials: Tally sheet or simple bar sketch; A short set of category counts. Adult tallies one category and sketches a bar. Child tallies three categories and answers one comparison question. Done: three tallies plus one correct comparison. Stop after the fresh check; keep optional challenge for another day.
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Start practiceCalculating the Mean practice
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Learning resources
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Illustrative Mathematics · Practice link — not the full lesson
Average Number of Siblings
Before you open · source notes
Average number of siblings supports calculating the mean. Not every median shortcut.
Free, no sign-in. A teacher solution is on the same page, so use the student view with your child.
Before you openAsk the learner to find the mean of a small data set and say what it represents.
Opening this link does not save learning or assess mastery.
Source, access and review notes
Public Illustrative Mathematics task page. The .html address responds HTTP 308 to this URL. An anonymous GET of this URL on 2026-11-12 returned HTTP 200 with no login or payment prompt. Where a teacher solution is present, it is on the same page as the student task; this check did not find a separate locked student view. An adult can use the student view section and should not read a solution aloud. Advertising was not observed in the fetched HTML text; that is not a browser, device, or ad-free guarantee. This is a paper or discussion task, not an automatically marked interactive game. Opening the link does not save practice or assess mastery. Diagrams on the page use missing or filename-only alt text, so they are not an accessible image equivalent. Accessibility still depends on an adult describing the picture.
Illustrative Mathematics. “Average Number of Siblings.” Licensed CC BY-NC-SA 4.0. External task; Gakuva does not copy, host, embed, or redistribute it.
CC BY-NC-SA 4.0 — link only
Check understanding
- Calculate the mean of five test scores: 72, 85, 90, 68, 95
- Explain what the mean represents and how it differs from individual data values
- Find a missing data value given the mean and all other values
“If the family scored 6, 8, 7, 5, and 9 on a board game over five rounds, can your child work out the mean (average) score?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Data & Statistics
- Age range
- Ages 8–13
Standards