Free Grade 3 Introducing Best Buy Problems Worksheets
Free Grade 3 worksheets for Introducing Best Buy Problems: 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
Higher
15 min
24
Learning objectives
Every objective is checkable, and each one maps to an activity and an assessment.
- RememberIdentify introducing best buy problems
Identify introducing best buy problems accurately in a familiar context.
Assessed by: Exit ticket of four short items
- UnderstandExplain introducing best buy problems
Explain introducing best buy problems accurately in a familiar context.
Assessed by: Exit ticket of four short items
- ApplyCalculate introducing best buy problems
Calculate introducing best buy problems accurately in a familiar context.
Assessed by: Exit ticket of four short items
- AnalyseCompare introducing best buy problems
Compare introducing best buy problems 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 Best Buy Problems 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.
- 1.2 pens cost $7.00. How much do 9 pens cost?[1]
- 2.3 pens cost $7.50. How much do 6 pens cost?[1]
- 3.4 pens cost $18.00. How much do 7 pens cost?[1]
- 4.5 pens cost $10.00. How much do 6 pens cost?[1]
- 5.6 pens cost $90.00. How much do 8 pens cost?[2]
- 6.2 pens cost $30.00. How much do 7 pens cost?[2]
- 7.6 pens cost $30.00. How much do 6 pens cost?[2]
- 8.4 pens cost $24.00. How much do 8 pens cost?[2]
- 9.6 pens cost $63.00. How much do 10 pens cost?[3]
- 10.5 pens cost $45.00. How much do 7 pens cost?[3]
- 11.5 pens cost $82.50. How much do 9 pens cost?[3]
- 12.6 pens cost $36.00. How much do 6 pens cost?[3]
Show answers and working
1. $31.50
Cost of 1 pen: $7.00 ÷ 2 = $3.50. 9 pens: 9 × $3.50 = $31.50.
2. $15.00
Cost of 1 pen: $7.50 ÷ 3 = $2.50. 6 pens: 6 × $2.50 = $15.00.
3. $31.50
Cost of 1 pen: $18.00 ÷ 4 = $4.50. 7 pens: 7 × $4.50 = $31.50.
4. $12.00
Cost of 1 pen: $10.00 ÷ 5 = $2.00. 6 pens: 6 × $2.00 = $12.00.
5. $120.00
Cost of 1 pen: $90.00 ÷ 6 = $15.00. 8 pens: 8 × $15.00 = $120.00.
6. $105.00
Cost of 1 pen: $30.00 ÷ 2 = $15.00. 7 pens: 7 × $15.00 = $105.00.
7. $30.00
Cost of 1 pen: $30.00 ÷ 6 = $5.00. 6 pens: 6 × $5.00 = $30.00.
8. $48.00
Cost of 1 pen: $24.00 ÷ 4 = $6.00. 8 pens: 8 × $6.00 = $48.00.
9. $105.00
Cost of 1 pen: $63.00 ÷ 6 = $10.50. 10 pens: 10 × $10.50 = $105.00.
10. $63.00
Cost of 1 pen: $45.00 ÷ 5 = $9.00. 7 pens: 7 × $9.00 = $63.00.
11. $148.50
Cost of 1 pen: $82.50 ÷ 5 = $16.50. 9 pens: 9 × $16.50 = $148.50.
12. $36.00
Cost of 1 pen: $36.00 ÷ 6 = $6.00. 6 pens: 6 × $6.00 = $36.00.
Worked examples
2 pens cost $2.00. How much do 8 pens cost?
- Cost of 1 pen: $2.00 ÷ 2 = $1.00.
- 8 pens: 8 × $1.00 = $8.00.
- Answer: $8.00
5 pens cost $50.00. How much do 8 pens cost?
- Cost of 1 pen: $50.00 ÷ 5 = $10.00.
- 8 pens: 8 × $10.00 = $80.00.
- Answer: $80.00
2 pens cost $9.00. How much do 9 pens cost?
- Cost of 1 pen: $9.00 ÷ 2 = $4.50.
- 9 pens: 9 × $4.50 = $40.50.
- Answer: $40.50
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.
Every free resource for Introducing Best Buy Problems
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Frequently asked
- Is this Grade 3 Introducing Best Buy Problems worksheet really free?
- Yes. Every worksheets 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 Scale Factors. Each one has its own free lesson, worksheet and quiz.
- How is the worksheet 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 Best Buy Problems?
- Move on to Working with Best Buy Problems, Best Buy Problems in Context, Direct Proportion, Inverse Proportion, which build directly on this idea.
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