Success TutoringWorksheets

Year 9 Best Buys and Unit Prices Worksheet — Level 3 — Practice Set 3 — Answers

Answer sheet with worked solutions for the Year 9 ratio & rates worksheet.

Download answers PDFPrint answersBack to worksheet
Success TutoringWorksheetsAnswer sheetYear 9 · Mathematics · Ratio & Rates

Year 9 Best Buys and Unit Prices Worksheet — Level 3 — Practice Set 3 — Answers

Find the price for the same amount of each (the unit price), then compare. Show your working.

1.Which is better value: oats at $12.00 for 2 kg, or at $6.70 for 1 kg?

Answer: $12.00 for 2 kg ($0.60 per 100 g)

  1. First: $12.00 ÷ 20 = $0.60 per 100 g
  2. Second: $6.70 ÷ 10 = $0.67 per 100 g
  3. The cheaper unit price is better value.
2.Which is better value: oats at $2.60 for 1 kg, or at $1.05 for 500 g?

Answer: $1.05 for 500 g ($0.21 per 100 g)

  1. First: $2.60 ÷ 10 = $0.26 per 100 g
  2. Second: $1.05 ÷ 5 = $0.21 per 100 g
  3. The cheaper unit price is better value.
3.Which is better value: pencils at $1.20 for a pack of 6, or at $4.20 for a pack of 12?

Answer: $1.20 for a pack of 6 ($0.20 per pencil)

  1. First: $1.20 ÷ 6 = $0.20 per pencil
  2. Second: $4.20 ÷ 12 = $0.35 per pencil
  3. The cheaper unit price is better value.
4.Which is better value: oats at $10.20 for 2 kg, or at $5.40 for 1 kg?

Answer: $10.20 for 2 kg ($0.51 per 100 g)

  1. First: $10.20 ÷ 20 = $0.51 per 100 g
  2. Second: $5.40 ÷ 10 = $0.54 per 100 g
  3. The cheaper unit price is better value.
5.Which is better value: pasta at $1.55 for 250 g, or at $8.00 for 1 kg?

Answer: $1.55 for 250 g ($0.62 per 100 g)

  1. First: $1.55 ÷ 2.5 = $0.62 per 100 g
  2. Second: $8.00 ÷ 10 = $0.80 per 100 g
  3. The cheaper unit price is better value.
6.Which is better value: oats at $12.20 for 2 kg, or at $3.70 for 500 g?

Answer: $12.20 for 2 kg ($0.61 per 100 g)

  1. First: $12.20 ÷ 20 = $0.61 per 100 g
  2. Second: $3.70 ÷ 5 = $0.74 per 100 g
  3. The cheaper unit price is better value.
7.Which is better value: oats at $6.50 for 1 kg, or at $3.10 for 500 g?

Answer: $3.10 for 500 g ($0.62 per 100 g)

  1. First: $6.50 ÷ 10 = $0.65 per 100 g
  2. Second: $3.10 ÷ 5 = $0.62 per 100 g
  3. The cheaper unit price is better value.
8.Which is better value: juice at $6.80 for 1 L, or at $2.00 for 250 mL?

Answer: $6.80 for 1 L ($0.68 per 100 mL)

  1. First: $6.80 ÷ 10 = $0.68 per 100 mL
  2. Second: $2.00 ÷ 2.5 = $0.80 per 100 mL
  3. The cheaper unit price is better value.
Free worksheets at worksheets.successtutoring.com · © Success Tutoring · Free for personal and classroom use

Marking tips

  • Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
  • For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
  • Celebrate what went well first, then pick one thing to work on next.

Great work. Here's what to try next: