Formal Probability Rules Worksheets
Free printable formal probability rules worksheets with step-by-step answer keys. Every worksheet is uniquely generated so students never see the same problems twice. Topics covered range from complement rule: p(not a) = 1 − p(a) at the easy level through to general addition rule with intersection at the advanced level.
CCSS.7.SPLK20.10
Difficulty Levels
Beginner
- Concepts
- Complement rule: P(not A) = 1 − P(A)
- Number Range
- probabilities 0.1–0.8
- Steps
- 1 step
- Example
- P(A) = 0.3. Find P(not A).
Easy
- Concepts
- Addition rule for mutually exclusive events
- Number Range
- fractions with denominators 3–8
- Steps
- 2 steps
- Example
- P(A)=1/4, P(B)=1/6, mutually exclusive. P(A or B)?
Medium
- Concepts
- Independent events multiplication (with tree diagram)
- Number Range
- probabilities 0.2–0.6
- Steps
- 2 steps
- Example
- P(rain)=0.4 each day. P(no rain both days)?
Hard
- Concepts
- General addition rule with intersection
- Number Range
- probabilities 0.3–0.6, intersection 0.05–0.25
- Steps
- 2 steps
- Example
- P(A)=0.5, P(B)=0.4, P(A and B)=0.15. P(A or B)?
Grade Availability
Formal Probability Rules worksheets are available for Grades 7–10. Problems are automatically adjusted to match grade-level expectations in number range, complexity, and notation.
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