What a symbol stands for
Recognise when a symbol (a box, shape, question mark or letter) is being used to stand for a number, and describe how it is being used: as an unknown number to be found, or as a quantity that can change
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What a symbol stands for 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: Paper shapes or a ruler and pencil; Shape name cards. Adult traces or shows one shape and names a property (sides/angles). Child identifies three shapes or measures one simple property and records it. Done: three correct shape/property responses. Stop after the fresh check; keep optional challenge for another day.
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Start practiceWhat a symbol stands for practice
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Learning resources
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Illustrative Mathematics · Practice link — not the full lesson
Find the Missing Number
Before you open · source notes
Missing-number sentences support what a symbol stands for. Not every two-variable algebra system.
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 missing number and say what the symbol stood for.
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. “Find the Missing Number.” 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
- In 7 + □ = 12, say that the box stands for a number we do not know yet
- Look at several number sentences and pattern rules and say which symbols stand for numbers and which are operation or equals signs
- Describe how a symbol is being used in a real situation (e.g. in 'n children each bring 2 apples', n can change from day to day, while in 4 + ? = 9 the ? is one unknown number)
“If your child sees a puzzle like 7 + □ = 12 on a homework sheet, can they explain that the box stands for a number we need to find?”
Curriculum record
- Type
- Conceptual
- Subject
- Mathematics
- Domain
- Algebra
- Age range
- Ages 7–10
Standards