Free Grade 3 Introduction to Working with Function Notation Techniques: Common Mistakes Lessons
Free Grade 3 lessons for Introduction to Working with Function Notation Techniques: Common Mistakes: 12 real questions with a full answer key and worked solutions. A function is a rule that turns an input into an output. The inverse function reverses it.
Free
Higher
15 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify introduction to working with function notation techniques: common mistakes
Identify introduction to working with function notation techniques: common mistakes accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain introduction to working with function notation techniques: common mistakes
Explain introduction to working with function notation techniques: common mistakes accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introduction to working with function notation techniques: common mistakes
Calculate introduction to working with function notation techniques: common mistakes accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introduction to working with function notation techniques: common mistakes
Compare introduction to working with function notation techniques: common mistakes 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 Working with Function Notation Techniques: Common Mistakes works
A function is a rule that turns an input into an output. The inverse function reverses it.
12 practice questions
Easy to hard, 24 marks in total. Try them first, then open the answers.
- 1.f(x) = 5x − 7. Find f(5).[1]
- 2.f(x) = 2x + 2. Find f(3).[1]
- 3.f(x) = 4x + 4. Find f(0).[1]
- 4.f(x) = 6x − 8. Find f(1).[1]
- 5.f(x) = 2x + 2. Find f(-1).[2]
- 6.f(x) = 3x − 2. Find f(0).[2]
- 7.f(x) = 4x + 1. Find f(0).[2]
- 8.f(x) = 2x + 8. Find f(-2).[2]
- 9.f(x) = 6x − 8. Find the inverse f⁻¹(x).[3]
- 10.f(x) = 5x − 1. Find the inverse f⁻¹(x).[3]
- 11.f(x) = 6x − 4. Find the inverse f⁻¹(x).[3]
- 12.f(x) = 6x + 5. Find the inverse f⁻¹(x).[3]
Show answers and working
1. 18
Replace x with 5: 5 × 5 − 7. = 18
2. 8
Replace x with 3: 2 × 3 + 2. = 8
3. 4
Replace x with 0: 4 × 0 + 4. = 4
4. -2
Replace x with 1: 6 × 1 − 8. = -2
5. 0
Replace x with -1: 2 × (-1) + 2. = 0
6. -2
Replace x with 0: 3 × 0 − 2. = -2
7. 1
Replace x with 0: 4 × 0 + 1. = 1
8. 4
Replace x with -2: 2 × (-2) + 8. = 4
9. f⁻¹(x) = (x + 8) / 6
Write y = 6x − 8 and swap x and y. Rearrange for y: y = (x + 8) / 6.
10. f⁻¹(x) = (x + 1) / 5
Write y = 5x − 1 and swap x and y. Rearrange for y: y = (x + 1) / 5.
11. f⁻¹(x) = (x + 4) / 6
Write y = 6x − 4 and swap x and y. Rearrange for y: y = (x + 4) / 6.
12. f⁻¹(x) = (x − 5) / 6
Write y = 6x + 5 and swap x and y. Rearrange for y: y = (x − 5) / 6.
Worked examples
f(x) = 2x + 4. Find f(-2).
- Replace x with -2: 2 × (-2) + 4.
- = 0
- Answer: 0
f(x) = 2x + 1. Find f(-1).
- Replace x with -1: 2 × (-1) + 1.
- = -1
- Answer: -1
f(x) = 3x + 2. Find the inverse f⁻¹(x).
- Write y = 3x + 2 and swap x and y.
- Rearrange for y: y = (x − 2) / 3.
- Answer: f⁻¹(x) = (x − 2) / 3
Interactive practice
Free, no account required — answer on screen or print it.
Common mistakes
What learners typically get wrong, and how to fix it.
Reads f(3) as f × 3.
Correction: f(3) means 'put 3 into the rule'.
Reverses operations in the wrong order for the inverse.
Correction: Undo the last step first.
Teacher tips
- · Use function machines before notation.
Parent tips
- · Play 'guess my rule' with numbers.
Real-life applications
- · Converting temperatures, phone-plan costs.
Assessment objectives
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Frequently asked
- Is this Grade 3 Introduction to Working with Function Notation Techniques: Common Mistakes lesson really free?
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- What should a learner already know before this?
- Start with Introduction to Working with Function Notation Techniques: Visual Models, Introduction to Working with Function Notation Techniques: Worked Examples, Working with Function Notation Essentials. Each one has its own free lesson, worksheet and quiz.
- How is the lesson 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 Working with Function Notation Techniques: Common Mistakes?
- Move on to Introduction to Working with Function Notation Techniques: Real-life Applications, Key Vocabulary of Working with Function Notation Techniques, Rules and Methods in Working with Function Notation Techniques, Working with Working with Function Notation Techniques, which build directly on this idea.
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