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Rounding and Approximation — DrFrost Y7 Lesson Notes

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Rounding and Approximation — DrFrost Y7 Lesson Notes

Authors: DrFrost Maths, Rhiannon Bourke Year: 2025 Venue: DrFrost Learning Platform Link: https://www.drfrost.org/downloadables.php (rid=14, noid=16) Tags: papers math y7 rounding education drfrost Created: 2026-05-30 Last Updated: 2026-05-30

Summary

This collection covers the Year 7 rounding and approximation curriculum: rounding to the nearest 10, 100, and 1000, rounding to a given number of decimal places, rounding to significant figures, estimation by rounding, and an introduction to error intervals. Approximately 10 individual resource packs are included, spanning both the original Tiffin Year 7 scheme and new 2024–2025 lesson packs.

Core Ideas

  • Rounding rules: look at the next digit — 5 or more rounds up, 4 or less rounds down
  • Decimal places count digits after the decimal point, not total digits
  • Significant figures count from the first non-zero digit
  • Estimation uses rounding to simplify calculations and check reasonableness
  • Error intervals give the range of possible original values for a rounded measurement

Teaching and Assessment Focus

  • Start with rounding to 10/100/1000 using place value understanding
  • Progress to decimal places with clear visualisation of the number line
  • Significant figures require explicit teaching of which zeros count as significant
  • Estimation in context: apply rounding to real-world problems
  • Error intervals prepare students for GCSE bounds work
  • Use gap-fill activities to check understanding of rounding conventions

Key Resources

  • Yr7-RoundingApproximation.pptx (25 slides) — Original unit covering dp, sf, and estimation
  • Rounding to the Nearest 10, 100 or 1000 — Lesson + exercise
  • Rounding to Decimal Places — Lesson + exercise
  • Rounding to Significant Figures — Lesson + 2 exercises (mini + full)
  • Estimation — Lesson + gap fills + exercise
  • Estimation in Context — Lesson + exercise
  • Error Intervals (including truncation) — Lesson + exercise

Sources

  • drfrost-downloads/Yr7-RoundingApproximation.pptx
  • drfrost-downloads/RoundingNearest-Lesson.pptx
  • drfrost-downloads/RoundingNearest-Ex.pdf

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