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Truth Tables

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Set it as homework or classwork and every answer is marked as pupils go, with feedback on what they got wrong. The scores go straight into your mark book, so you can see who needs help before the next lesson.

  • 11 questions
  • 35 marks
  • about 40 minutes
  • marked instantly

Question types: truth table, wordsearch, multiple choice, matching, calculation.

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Try one from this worksheet

A truth table needs one row for every possible input combination. The number of rows is found with the rule 2ⁿ, where n is the number of inputs. How many rows does a truth table need for a circuit with 4 inputs?

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About this resource

Computing — Logic & Circuits, Lesson 4 of 6. Building a full truth table for a gate or circuit: listing every input combination systematically (2 inputs → 4 rows, 3 inputs → 8 rows using 2^n), then tracing each combination through the circuit to work out the output for every row.

16 slides.

Lesson outline

  1. Hook — Tested Three Out of Four
  2. Do Now — Retrieval
  3. Keywords for This Lesson
  4. What Is a Truth Table?
  5. Listing Every Combination — Count in Binary
  6. Hinge Check — How Many Rows?
  7. Hinge Check — Which List Is Complete?
  8. Task 1 (guided) — How Many Rows?
  9. We Do — Fill the Table for This OR Gate
  10. Task 1 (guided) — Truth Table Facts
  11. Now a Two-Gate Circuit — Trace Each Row
  12. The Circuit for Your Task — the Greenhouse Fan
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Part of: Logic: the whole unitEvery resource in the unit in one zip.

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