Fluent addition and subtraction
Recall and use addition and subtraction facts to 20 fluently, and derive and use related facts up to 100
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1858 concepts · 9 subjects
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Teaching approaches
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1 approach
Fluent addition and subtraction 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: 20 counters; Paper and pencil. Adult models 12 − 4 by removing counters, then writes the difference. Child solves three subtraction problems with counters and records each difference. Done: three correct differences with counters matching the writing. Stop after the fresh check; keep optional challenge for another day.
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Practice this concept
Start practiceFluent addition and subtraction practice
Practice key ideas from Fluent addition and subtraction.
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Learning resources
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Illustrative Mathematics · Practice link — not the full lesson
Building toward fluency
Before you open · source notes
Short practice builds toward fluent addition and subtraction within 20. Use it for fluency, not every multi-digit method.
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 solve a few within-20 facts quickly and correctly without counting every object.
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. “Building toward fluency.” 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
- Rapidly recall 7 + 8 = 15 and 15 − 8 = 7
- Use 6 + 4 = 10 to derive 60 + 40 = 100
- Derive 35 + 5 = 40 from knowledge that 5 + 5 = 10
“Can your child quickly recall facts like '9 + 7 = 16' and '16 − 7 = 9', and use those to help work out bigger sums like '90 + 70'?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Addition & Subtraction
- Age range
- Ages 6–9
Standards