Free Grade 3 Inverse Functions in Context Lesson Plans
Free Grade 3 lesson plans for Inverse Functions in Context: 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
Foundation
15 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify inverse functions in context
Identify inverse functions in context accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain inverse functions in context
Explain inverse functions in context accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate inverse functions in context
Calculate inverse functions in context accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare inverse functions in context
Compare inverse functions in context 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 Inverse Functions in Context 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) = 4x + 0. Find f(-4).[1]
- 2.f(x) = 4x + 4. Find f(3).[1]
- 3.f(x) = 5x − 3. Find f(1).[1]
- 4.f(x) = 6x + 4. Find f(-1).[1]
- 5.f(x) = 6x + 4. Find f(4).[2]
- 6.f(x) = 2x − 3. Find f(-2).[2]
- 7.f(x) = 4x + 4. Find f(4).[2]
- 8.f(x) = 3x − 4. Find f(3).[2]
- 9.f(x) = 2x + 0. Find the inverse f⁻¹(x).[3]
- 10.f(x) = 6x − 8. Find the inverse f⁻¹(x).[3]
- 11.f(x) = 5x + 3. Find the inverse f⁻¹(x).[3]
- 12.f(x) = 6x − 2. Find the inverse f⁻¹(x).[3]
Show answers and working
1. -16
Replace x with -4: 4 × (-4) + 0. = -16
2. 16
Replace x with 3: 4 × 3 + 4. = 16
3. 2
Replace x with 1: 5 × 1 − 3. = 2
4. -2
Replace x with -1: 6 × (-1) + 4. = -2
5. 28
Replace x with 4: 6 × 4 + 4. = 28
6. -7
Replace x with -2: 2 × (-2) − 3. = -7
7. 20
Replace x with 4: 4 × 4 + 4. = 20
8. 5
Replace x with 3: 3 × 3 − 4. = 5
9. f⁻¹(x) = (x − 0) / 2
Write y = 2x + 0 and swap x and y. Rearrange for y: y = (x − 0) / 2.
10. f⁻¹(x) = (x + 8) / 6
Write y = 6x − 8 and swap x and y. Rearrange for y: y = (x + 8) / 6.
11. f⁻¹(x) = (x − 3) / 5
Write y = 5x + 3 and swap x and y. Rearrange for y: y = (x − 3) / 5.
12. f⁻¹(x) = (x + 2) / 6
Write y = 6x − 2 and swap x and y. Rearrange for y: y = (x + 2) / 6.
Worked examples
f(x) = 4x + 2. Find f(-4).
- Replace x with -4: 4 × (-4) + 2.
- = -14
- Answer: -14
f(x) = 4x − 2. Find f(-3).
- Replace x with -3: 4 × (-3) − 2.
- = -14
- Answer: -14
f(x) = 3x − 4. Find the inverse f⁻¹(x).
- Write y = 3x − 4 and swap x and y.
- Rearrange for y: y = (x + 4) / 3.
- Answer: f⁻¹(x) = (x + 4) / 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
How mastery is evidenced, and which standards it maps to.
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Frequently asked
- Is this Grade 3 Inverse Functions in Context lesson plan really free?
- Yes. Every lesson plans on FreeMathWorksheet is free to use, print and share — no account, no paywall and no watermark.
- What should a learner already know before this?
- Start with Working with Inverse Functions, Introducing Inverse Functions, Composite Functions. Each one has its own free lesson, worksheet and quiz.
- How is the lesson plan 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 Inverse Functions in Context?
- Move on to Function Notation, Domain and Range, Composite Functions, which build directly on this idea.
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