Boolean LogicExam Tips
Exam Tips - Boolean Expressions
Part of Boolean Expressions — GCSE Computer Science
This exam tips covers Exam Tips - Boolean Expressions within Boolean Expressions for GCSE Computer Science. Revise Boolean Expressions in Boolean Logic for GCSE Computer Science with 15 exam-style questions and 22 flashcards. This topic appears less often, but it can still be a useful differentiator on mixed-topic papers. It is section 11 of 11 in this topic. Treat this as a marking guide for what examiners are looking for, not just a fact list.
Topic position
Section 11 of 11
Practice
15 questions
Recall
22 flashcards
Exam Tips - Boolean Expressions
When writing Boolean expressions:
- Use brackets liberally - makes order of operations crystal clear
- Be consistent - don't mix "AND" with "∧" in same answer
- OCR accepts: AND/OR/NOT or symbols ∧/∨/¬ - choose what you're comfortable with
- Check your NOT placement: NOT(A AND B) is very different from NOT(A) AND B
When evaluating expressions:
- Show ALL steps - write out intermediate values for method marks
- Work inside-out: Brackets first, then NOT, then AND, finally OR
- Substitute values clearly: Write "NOT(1) = 0" not just "0"
- Double-check: Re-evaluate your final answer with original values
Common mistakes to avoid:
- NOT(A AND B) ≠ NOT(A) AND NOT(B) - these are DIFFERENT!
- Forgetting brackets when needed - A AND B OR C is ambiguous
- Missing the difference between NOT(A) AND B vs NOT(A AND B)
- Writing A·B without defining that · means AND in your answer
Translation tips (English to Boolean):
- "Both" / "all" → AND operation
- "Either" / "or" / "at least one" → OR operation
- "Not" / "opposite" / "false" → NOT operation
- "Only when A but not B" → A AND NOT(B)