Enrich · Stage 4 · Fractions, decimals and percentages

Enrich Identify and define irrational numbers as numbers that cannot be written in the form a/b where a and b are integers and b≠0

Extension and enrichment for students who are ready to go deeper: rich tasks, problem solving and open-ended challenges.

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• Interactive toolStarterEnrich
  Estimation 180
  Estimation 180 (Andrew Stadel) · Interactive (browser) · Free · Link checked 2026-10-15 · No prep
  Use it for: Daily estimation challenges to build number sense and reasoning about approximations.
• Rich taskEnrichmentEarly finishersEnrich
  NRICH: Antiques Roadshow
  NRICH (University of Cambridge) · Web page · Free · Link checked 2026-10-15 · Low floor high ceiling, Teacher notes
  Use it for: Low-floor, high-ceiling NRICH task extending this dot point; use for extension or a problem-solving lesson.
• Rich taskEnrichmentEarly finishersEnrich
  NRICH: Fractions Jigsaw
  NRICH (University of Cambridge) · Web page · Free · Link checked 2026-10-15 · Low floor high ceiling, Teacher notes
  Use it for: Low-floor, high-ceiling NRICH task extending this dot point; use for extension or a problem-solving lesson.
• Rich taskEnrichmentEarly finishersEnrich
  NRICH: Peaches Today, Peaches Tomorrow...
  NRICH (University of Cambridge) · Web page · Free · Link checked 2026-10-15 · Low floor high ceiling, Teacher notes
  Use it for: Low-floor, high-ceiling NRICH task extending this dot point; use for extension or a problem-solving lesson.
• Rich taskEnrichmentEarly finishersEnrich
  NRICH: Percentage Unchanged
  NRICH (University of Cambridge) · Web page · Free · Link checked 2026-10-15 · Low floor high ceiling, Teacher notes
  Use it for: Low-floor, high-ceiling NRICH task extending this dot point; use for extension or a problem-solving lesson.
• Rich taskEnrichmentEarly finishersEnrich
  NRICH: Repetitiously
  NRICH (University of Cambridge) · Web page · Free · Link checked 2026-10-15 · Low floor high ceiling, Teacher notes
  Use it for: Low-floor, high-ceiling NRICH task extending this dot point; use for extension or a problem-solving lesson.
• Rich taskEarly finishersEnrich
  Open Middle: problem collection
  Open Middle · Web page · Free · Link checked 2026-10-15 · Low floor high ceiling
  Use it for: Problems with one answer but many paths; use as low-floor high-ceiling extensions.