Free Grade 3 Working with Function Notation in Context Common Errors: Common Mistakes Quizzes
Free Grade 3 quizzes for Working with Function Notation in Context Common Errors: 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
Core
25 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify working with function notation in context common errors: common mistakes
Identify working with function notation in context common errors: common mistakes accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain working with function notation in context common errors: common mistakes
Explain working with function notation in context common errors: common mistakes accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate working with function notation in context common errors: common mistakes
Calculate working with function notation in context common errors: common mistakes accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare working with function notation in context common errors: common mistakes
Compare working with function notation in context common errors: 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 Working with Function Notation in Context Common Errors: 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 + 5. Find f(-4).[1]
- 2.f(x) = 5x − 8. Find f(1).[1]
- 3.f(x) = 6x − 8. Find f(5).[1]
- 4.f(x) = 5x + 0. Find f(-2).[1]
- 5.f(x) = 5x − 5. Find f(3).[2]
- 6.f(x) = 4x + 8. Find f(-1).[2]
- 7.f(x) = 6x + 6. Find f(3).[2]
- 8.f(x) = 2x + 4. Find f(-3).[2]
- 9.f(x) = 5x + 5. Find the inverse f⁻¹(x).[3]
- 10.f(x) = 6x − 5. Find the inverse f⁻¹(x).[3]
- 11.f(x) = 2x + 3. Find the inverse f⁻¹(x).[3]
- 12.f(x) = 6x − 8. Find the inverse f⁻¹(x).[3]
Show answers and working
1. -15
Replace x with -4: 5 × (-4) + 5. = -15
2. -3
Replace x with 1: 5 × 1 − 8. = -3
3. 22
Replace x with 5: 6 × 5 − 8. = 22
4. -10
Replace x with -2: 5 × (-2) + 0. = -10
5. 10
Replace x with 3: 5 × 3 − 5. = 10
6. 4
Replace x with -1: 4 × (-1) + 8. = 4
7. 24
Replace x with 3: 6 × 3 + 6. = 24
8. -2
Replace x with -3: 2 × (-3) + 4. = -2
9. f⁻¹(x) = (x − 5) / 5
Write y = 5x + 5 and swap x and y. Rearrange for y: y = (x − 5) / 5.
10. f⁻¹(x) = (x + 5) / 6
Write y = 6x − 5 and swap x and y. Rearrange for y: y = (x + 5) / 6.
11. f⁻¹(x) = (x − 3) / 2
Write y = 2x + 3 and swap x and y. Rearrange for y: y = (x − 3) / 2.
12. f⁻¹(x) = (x + 8) / 6
Write y = 6x − 8 and swap x and y. Rearrange for y: y = (x + 8) / 6.
Worked examples
f(x) = 5x + 1. Find f(2).
- Replace x with 2: 5 × 2 + 1.
- = 11
- Answer: 11
f(x) = 6x + 4. Find f(6).
- Replace x with 6: 6 × 6 + 4.
- = 40
- Answer: 40
f(x) = 4x + 2. Find the inverse f⁻¹(x).
- Write y = 4x + 2 and swap x and y.
- Rearrange for y: y = (x − 2) / 4.
- Answer: f⁻¹(x) = (x − 2) / 4
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
How mastery is evidenced, and which standards it maps to.
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Frequently asked
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- Start with Working with Function Notation in Context Common Errors: Visual Models, Working with Function Notation in Context Common Errors: Worked Examples, Rules and Methods in Function Notation in Context Common Errors. Each one has its own free lesson, worksheet and quiz.
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- Recognition first, then understanding, application, reasoning and finally mastery — the same ladder used across every free resource on the platform.
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- Move on to Working with Function Notation in Context Common Errors: Real-life Applications, Introduction to Function Notation in Context Common Errors, Key Vocabulary of Function Notation in Context Common Errors, Rules and Methods in Function Notation in Context Common Errors, which build directly on this idea.
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