Free Grade 3 Introducing Inverse Proportion Lesson Plans
Free Grade 3 lesson plans for Introducing Inverse Proportion: 12 real questions with a full answer key and worked solutions. In direct proportion, when one amount doubles the other doubles too. Find the value of one unit, then scale up.
Free
Foundation
30 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify introducing inverse proportion
Identify introducing inverse proportion accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain introducing inverse proportion
Explain introducing inverse proportion accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introducing inverse proportion
Calculate introducing inverse proportion accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introducing inverse proportion
Compare introducing inverse proportion 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 Introducing Inverse Proportion works
In direct proportion, when one amount doubles the other doubles too. Find the value of one unit, then scale up.
12 practice questions
Easy to hard, 24 marks in total. Try them first, then open the answers.
- 1.3 pens cost $3.00. How much do 10 pens cost?[1]
- 2.5 pens cost $20.00. How much do 11 pens cost?[1]
- 3.5 pens cost $27.50. How much do 12 pens cost?[1]
- 4.3 pens cost $18.00. How much do 7 pens cost?[1]
- 5.3 pens cost $36.00. How much do 10 pens cost?[2]
- 6.5 pens cost $65.00. How much do 10 pens cost?[2]
- 7.2 pens cost $26.00. How much do 10 pens cost?[2]
- 8.3 pens cost $33.00. How much do 3 pens cost?[2]
- 9.2 pens cost $27.00. How much do 9 pens cost?[3]
- 10.4 pens cost $60.00. How much do 10 pens cost?[3]
- 11.4 pens cost $66.00. How much do 3 pens cost?[3]
- 12.3 pens cost $27.00. How much do 11 pens cost?[3]
Show answers and working
1. $10.00
Cost of 1 pen: $3.00 ÷ 3 = $1.00. 10 pens: 10 × $1.00 = $10.00.
2. $44.00
Cost of 1 pen: $20.00 ÷ 5 = $4.00. 11 pens: 11 × $4.00 = $44.00.
3. $66.00
Cost of 1 pen: $27.50 ÷ 5 = $5.50. 12 pens: 12 × $5.50 = $66.00.
4. $42.00
Cost of 1 pen: $18.00 ÷ 3 = $6.00. 7 pens: 7 × $6.00 = $42.00.
5. $120.00
Cost of 1 pen: $36.00 ÷ 3 = $12.00. 10 pens: 10 × $12.00 = $120.00.
6. $130.00
Cost of 1 pen: $65.00 ÷ 5 = $13.00. 10 pens: 10 × $13.00 = $130.00.
7. $130.00
Cost of 1 pen: $26.00 ÷ 2 = $13.00. 10 pens: 10 × $13.00 = $130.00.
8. $33.00
Cost of 1 pen: $33.00 ÷ 3 = $11.00. 3 pens: 3 × $11.00 = $33.00.
9. $121.50
Cost of 1 pen: $27.00 ÷ 2 = $13.50. 9 pens: 9 × $13.50 = $121.50.
10. $150.00
Cost of 1 pen: $60.00 ÷ 4 = $15.00. 10 pens: 10 × $15.00 = $150.00.
11. $49.50
Cost of 1 pen: $66.00 ÷ 4 = $16.50. 3 pens: 3 × $16.50 = $49.50.
12. $99.00
Cost of 1 pen: $27.00 ÷ 3 = $9.00. 11 pens: 11 × $9.00 = $99.00.
Worked examples
3 pens cost $22.50. How much do 11 pens cost?
- Cost of 1 pen: $22.50 ÷ 3 = $7.50.
- 11 pens: 11 × $7.50 = $82.50.
- Answer: $82.50
2 pens cost $8.00. How much do 4 pens cost?
- Cost of 1 pen: $8.00 ÷ 2 = $4.00.
- 4 pens: 4 × $4.00 = $16.00.
- Answer: $16.00
2 pens cost $15.00. How much do 12 pens cost?
- Cost of 1 pen: $15.00 ÷ 2 = $7.50.
- 12 pens: 12 × $7.50 = $90.00.
- Answer: $90.00
Interactive practice
Free, no account required — answer on screen or print it.
Common mistakes
What learners typically get wrong, and how to fix it.
Adds instead of scaling.
Correction: Work out the cost of ONE first.
Rounds the unit price too early.
Correction: Keep the exact unit value until the end.
Teacher tips
- · Use a ratio table to keep working organised.
Parent tips
- · Compare price per item on multipacks.
Real-life applications
- · Best-value shopping, currency conversion.
Assessment objectives
How mastery is evidenced, and which standards it maps to.
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Frequently asked
- Is this Grade 3 Introducing Inverse Proportion 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 Direct Proportion. 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 Introducing Inverse Proportion?
- Move on to Working with Inverse Proportion, Inverse Proportion in Context, Direct Proportion, Scale Factors, which build directly on this idea.
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