Lesson Plan

• Describe the direct relationship between a single hexadecimal digit and its 4‑bit binary equivalent.
• Apply step‑by‑step procedures to convert positive hexadecimal numbers to binary.
• Apply step‑by‑step procedures to convert positive binary numbers to hexadecimal, including proper zero‑padding.
• Perform exam‑style conversion questions accurately and check work using the conversion table.
• Identify and correct common errors such as missing padding and digit order mistakes.

• Projector or interactive whiteboard
• Printed hex‑to‑binary conversion table handout
• Worksheet with practice conversion questions
• Whiteboard and markers
• Calculators (optional)
• Laptops/computers for pair work (if available)

Begin with a quick question: “Why do programmers prefer hexadecimal when reading memory addresses?” Connect this to students’ prior knowledge of binary and hex symbols. Explain that today’s success criteria are to convert both ways accurately and to spot typical mistakes.

1. Do‑Now (5’): Individual conversion of 3B7 to binary using the handout.
2. Mini‑lecture (10’): Review the hex‑binary mapping table, demonstrate Hex→Binary and Binary→Hex procedures.
3. Guided Practice (15’): Whole‑class walk‑through of Example 1 (Hex→Binary) and Example 2 (Binary→Hex), students copy steps on their worksheets.
4. Pair Activity (15’): Students complete the practice worksheet (four questions) and check each other’s work with the table.
5. Common Pitfalls (5’): Show a deliberately incorrect conversion; students identify and correct the error.
6. Exit Ticket (5’): Write one correct hex‑to‑binary conversion and note one mistake to avoid.

Recap the one‑to‑one mapping of hex digits to 4‑bit groups and the importance of padding binary groups. Collect exit tickets as a quick retrieval check. For homework, assign two additional conversion problems (one each way) to reinforce the steps.