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: rice at $4.80 for 2 kg, or at $1.35 for 500 g?

Answer: $4.80 for 2 kg ($0.24 per 100 g)

  1. First: $4.80 ÷ 20 = $0.24 per 100 g
  2. Second: $1.35 ÷ 5 = $0.27 per 100 g
  3. The cheaper unit price is better value.
2.Which is better value: juice at $14.80 for 2 L, or at $5.50 for 1 L?

Answer: $5.50 for 1 L ($0.55 per 100 mL)

  1. First: $14.80 ÷ 20 = $0.74 per 100 mL
  2. Second: $5.50 ÷ 10 = $0.55 per 100 mL
  3. The cheaper unit price is better value.
3.Which is better value: pencils at $20.64 for a pack of 24, or at $9.84 for a pack of 12?

Answer: $9.84 for a pack of 12 ($0.82 per pencil)

  1. First: $20.64 ÷ 24 = $0.86 per pencil
  2. Second: $9.84 ÷ 12 = $0.82 per pencil
  3. The cheaper unit price is better value.
4.Which is better value: rice at $1.60 for 500 g, or at $4.40 for 2 kg?

Answer: $4.40 for 2 kg ($0.22 per 100 g)

  1. First: $1.60 ÷ 5 = $0.32 per 100 g
  2. Second: $4.40 ÷ 20 = $0.22 per 100 g
  3. The cheaper unit price is better value.
5.Which is better value: juice at $0.60 for 250 mL, or at $3.30 for 1 L?

Answer: $0.60 for 250 mL ($0.24 per 100 mL)

  1. First: $0.60 ÷ 2.5 = $0.24 per 100 mL
  2. Second: $3.30 ÷ 10 = $0.33 per 100 mL
  3. The cheaper unit price is better value.
6.Which is better value: oats at $6.90 for 1 kg, or at $4.25 for 500 g?

Answer: $6.90 for 1 kg ($0.69 per 100 g)

  1. First: $6.90 ÷ 10 = $0.69 per 100 g
  2. Second: $4.25 ÷ 5 = $0.85 per 100 g
  3. The cheaper unit price is better value.
7.Which is better value: oats at $14.80 for 2 kg, or at $2.80 for 500 g?

Answer: $2.80 for 500 g ($0.56 per 100 g)

  1. First: $14.80 ÷ 20 = $0.74 per 100 g
  2. Second: $2.80 ÷ 5 = $0.56 per 100 g
  3. The cheaper unit price is better value.
8.Which is better value: pasta at $0.65 for 250 g, or at $0.70 for 500 g?

Answer: $0.70 for 500 g ($0.14 per 100 g)

  1. First: $0.65 ÷ 2.5 = $0.26 per 100 g
  2. Second: $0.70 ÷ 5 = $0.14 per 100 g
  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: