Lesson Plan

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Lesson Plan
Grade: Date: 17/01/2026
Subject: Computer Science
Lesson Topic: Convert between positive denary and positive hexadecimal
Learning Objective/s:
  • Describe the relationship between decimal and hexadecimal place values.
  • Apply the repeated‑division algorithm to convert positive decimal numbers to hexadecimal.
  • Apply the positional‑value algorithm to convert positive hexadecimal numbers to decimal.
  • Verify conversions by performing a back‑conversion and using the hex‑digit reference table.
Materials Needed:
  • Projector or interactive whiteboard
  • Printed worksheets with conversion tables and practice questions
  • Calculator (optional)
  • Hex‑digit reference chart (A–F)
  • Whiteboard and markers
 Introduction:
Begin with a quick question: “How many different ways can we write the number 255?” Review students’ familiarity with base‑10 and binary, then announce that today they will master converting between decimal and hexadecimal. Success criteria are stated: students will accurately perform both conversions and check their work using the reference chart.
Lesson Structure:
  1. Do‑now (5’) – Quick quiz on decimal place values and list the hex digits A‑F; teacher checks answers.
  2. Mini‑lecture (10’) – Explain base‑16, show side‑by‑side powers of 10 and 16, demonstrate the repeated‑division algorithm with 439₁₀ → 1B7₁₆.
  3. Guided practice (12’) – Whole‑class conversion of 1024₁₀ to hex, modelling each step on the board.
  4. Pair activity (10’) – Students use the positional algorithm to convert 2F3₁₆ to decimal, completing a worksheet table.
  5. Consolidation (8’) – Round‑trip conversion of 255₁₀ → hex → back to decimal; peer checking.
  6. Exit ticket (5’) – Write the most useful step of either algorithm and solve 7B₁₆ → decimal.
Conclusion:
Recap the two algorithms and the importance of the hex‑digit reference chart. Collect exit tickets and remind students that the worksheet with five additional conversion problems is due for homework. Encourage them to practice both directions to build fluency for the upcoming exam.