Free Grade 3 Introduction to Introducing Probability Scale Common Errors Quizzes
Free Grade 3 quizzes for Introduction to Introducing Probability Scale Common Errors: 12 real questions with a full answer key and worked solutions. Probability measures how likely something is, from 0 (impossible) to 1 (certain). P(event) = favourable outcomes ÷ total outcomes. For independent events, multiply.
Free
Stretch
35 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify introduction to introducing probability scale common errors
Identify introduction to introducing probability scale common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain introduction to introducing probability scale common errors
Explain introduction to introducing probability scale common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introduction to introducing probability scale common errors
Calculate introduction to introducing probability scale common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introduction to introducing probability scale common errors
Compare introduction to introducing probability scale common errors accurately in a familiar context.
Assessed by: Exit ticket of four short items
Prerequisites
Close these gaps first — each has its own free lesson, worksheet and quiz.
How Introduction to Introducing Probability Scale Common Errors works
Probability measures how likely something is, from 0 (impossible) to 1 (certain). P(event) = favourable outcomes ÷ total outcomes. For independent events, multiply.
12 practice questions
Easy to hard, 24 marks in total. Try them first, then open the answers.
- 1.A bag has 5 red, 2 blue and 5 green counters. One is picked at random. Find P(red).[1]
- 2.A bag has 7 red, 6 blue and 0 green counters. One is picked at random. Find P(red).[1]
- 3.A bag has 8 red, 8 blue and 5 green counters. One is picked at random. Find P(red).[1]
- 4.A bag has 8 red, 1 blue and 2 green counters. One is picked at random. Find P(red).[1]
- 5.A bag has 7 red, 3 blue and 0 green counters. One is picked at random. Find P(red) and P(not red).[2]
- 6.A bag has 2 red, 1 blue and 3 green counters. One is picked at random. Find P(red) and P(not red).[2]
- 7.A bag has 4 red, 6 blue and 1 green counters. One is picked at random. Find P(red) and P(not red).[2]
- 8.A bag has 5 red, 6 blue and 1 green counters. One is picked at random. Find P(red) and P(not red).[2]
- 9.A bag has 6 red and 1 blue counters. Two are picked with replacement. Find P(both red).[3]
- 10.A bag has 4 red and 1 blue counters. Two are picked with replacement. Find P(both red).[3]
- 11.A bag has 2 red and 4 blue counters. Two are picked with replacement. Find P(both red).[3]
- 12.A bag has 2 red and 7 blue counters. Two are picked with replacement. Find P(both red).[3]
Show answers and working
1. P(red) = 5/12
Total counters = 12. P(red) = 5/12 = 5/12.
2. P(red) = 7/13
Total counters = 13. P(red) = 7/13 = 7/13.
3. P(red) = 8/21
Total counters = 21. P(red) = 8/21 = 8/21.
4. P(red) = 8/11
Total counters = 11. P(red) = 8/11 = 8/11.
5. P(red) = 7/10, P(not red) = 3/10
Total counters = 10. P(red) = 7/10 = 7/10. P(not red) = 1 − 7/10 = 3/10.
6. P(red) = 1/3, P(not red) = 2/3
Total counters = 6. P(red) = 2/6 = 1/3. P(not red) = 1 − 1/3 = 2/3.
7. P(red) = 4/11, P(not red) = 7/11
Total counters = 11. P(red) = 4/11 = 4/11. P(not red) = 1 − 4/11 = 7/11.
8. P(red) = 5/12, P(not red) = 7/12
Total counters = 12. P(red) = 5/12 = 5/12. P(not red) = 1 − 5/12 = 7/12.
9. 36/49
P(red) = 6/7 each time. Independent, so multiply: 6/7 × 6/7 = 36/49.
10. 16/25
P(red) = 4/5 each time. Independent, so multiply: 4/5 × 4/5 = 16/25.
11. 1/9
P(red) = 2/6 each time. Independent, so multiply: 2/6 × 2/6 = 1/9.
12. 4/81
P(red) = 2/9 each time. Independent, so multiply: 2/9 × 2/9 = 4/81.
Worked examples
A bag has 5 red, 8 blue and 1 green counters. One is picked at random. Find P(red).
- Total counters = 14.
- P(red) = 5/14 = 5/14.
- Answer: P(red) = 5/14
A bag has 3 red, 2 blue and 5 green counters. One is picked at random. Find P(red) and P(not red).
- Total counters = 10.
- P(red) = 3/10 = 3/10.
- P(not red) = 1 − 3/10 = 7/10.
- Answer: P(red) = 3/10, P(not red) = 7/10
A bag has 7 red and 4 blue counters. Two are picked with replacement. Find P(both red).
- P(red) = 7/11 each time.
- Independent, so multiply: 7/11 × 7/11 = 49/121.
- Answer: 49/121
Interactive practice
Free, no account required — answer on screen or print it.
Common mistakes
What learners typically get wrong, and how to fix it.
Writes probability as a ratio like 3:5.
Correction: Use a fraction, decimal or percentage.
Adds probabilities for 'and' events.
Correction: 'And' means multiply when events are independent.
Teacher tips
- · Run real experiments with dice and compare to theory.
Parent tips
- · Talk about the chance of rain from the forecast.
Real-life applications
- · Weather forecasts, games, insurance.
Assessment objectives
How mastery is evidenced, and which standards it maps to.
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Frequently asked
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- What should a learner already know before this?
- Start with Introducing Probability Scale Word Problems. Each one has its own free lesson, worksheet and quiz.
- How is the quiz sequenced?
- Recognition first, then understanding, application, reasoning and finally mastery — the same ladder used across every free resource on the platform.
- What comes next after Introduction to Introducing Probability Scale Common Errors?
- Move on to Key Vocabulary of Introducing Probability Scale Common Errors, Rules and Methods in Introducing Probability Scale Common Errors, Working with Introducing Probability Scale Common Errors, Introducing Probability Scale Common Errors in Examinations, which build directly on this idea.
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