A complete, ready-to-teach PowerPoint lesson on factorial notation for Pearson Edexcel International A Level Pure Mathematics 2 (WMA12). It covers factorials and ⁿCᵣ. Students calculate factorials and combinations, cancel factorials by hand, link ⁿCᵣ to entries in Pascal’s triangle and solve ⁿC₂ = 28 for n.

What’s included (19 slides):

• Learning objectives, prior knowledge and key words
• 5-minute retrieval starter
• Explanation slides: Factorials and combinations; Cancelling factorials by hand
• 4 worked examples, built up one step per click, each followed by a “You Do” question with a full worked solution
• Common mistakes slide
• Practice questions with answers
• Exam-style question (4 marks) with full mark scheme
• Exit ticket and “Can I…” checklist
• Speaker notes on every slide

Follows section 4.2 of the Pearson Edexcel IAL Pure Mathematics 2 textbook, with Exercise 4B suggested for independent practice. All questions are original.

For video lessons, find Mr Edine Maths on YouTube (@mredinemaths).