GCSE & iGCSE Probability Rules worksheet

Probability rules worksheet for GCSE and iGCSE maths: adding for OR, multiplying for AND, and at least one, neither and exactly one. With full solutions.

A complete probability rules (and and or) worksheet for Pearson Edexcel GCSE (1MA1) and International GCSE (4MA1), written so one resource works for both tiers. Every section is clearly labelled Foundation or Higher, and questions get harder as you go.

What’s covered — Foundation

Adding probabilities of mutually exclusive outcomes (OR)
Multiplying probabilities of independent events (AND)
Finding “at least one”, “neither” and “exactly one”

What’s covered — Higher (grades 6 to 9)

Events without replacement
Three events
Testing whether events are independent
Forming and solving equations from probabilities

How it’s structured

A. Worked examples & Your turn — a model solution beside a matching question to try
B. Fluency — core skills
C. Reasoning — explain it
D. Problem solving — unfamiliar, multi-step questions
E. Exam practice — exam-style questions with mark allocations

126 marks across Sections B to E (63 Foundation, 63 Higher), with a progress tracker on the front page so students can record their score per section. “At least one” is treated as its own skill via the complement, which is the shortcut students most often miss under exam pressure.

How to use it

Works as a full lesson, homework, a cover lesson or targeted intervention. Because each tier is labelled, you can set the Foundation sections to one group and the Higher sections to another from the same print.

What’s included

13-page worksheet (PDF, printable, with answer spaces)
6-page full worked solutions (PDF) — complete method for every question, not just final answers
Calculator allowed

Specification

Pearson Edexcel GCSE Mathematics (1MA1) and International GCSE Mathematics (4MA1), Probability. All questions are original.