Success TutoringWorksheets

Year 8 Best Buys and Unit Prices Worksheet — Level 3 — Practice Set 3 — Answers

Answer sheet with worked solutions for the Year 8 ratio & rates worksheet.

Download answers PDFPrint answersBack to worksheet
Success TutoringWorksheetsAnswer sheetYear 8 · Mathematics · Ratio & Rates

Year 8 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 $2.50 for 500 g, or at $5.40 for 1 kg?

Answer: $2.50 for 500 g ($0.50 per 100 g)

  1. First: $2.50 ÷ 5 = $0.50 per 100 g
  2. Second: $5.40 ÷ 10 = $0.54 per 100 g
  3. The cheaper unit price is better value.
2.Which is better value: rice at $2.75 for 500 g, or at $7.50 for 1 kg?

Answer: $2.75 for 500 g ($0.55 per 100 g)

  1. First: $2.75 ÷ 5 = $0.55 per 100 g
  2. Second: $7.50 ÷ 10 = $0.75 per 100 g
  3. The cheaper unit price is better value.
3.Which is better value: rice at $2.10 for 1 kg, or at $0.45 for 500 g?

Answer: $0.45 for 500 g ($0.09 per 100 g)

  1. First: $2.10 ÷ 10 = $0.21 per 100 g
  2. Second: $0.45 ÷ 5 = $0.09 per 100 g
  3. The cheaper unit price is better value.
4.Which is better value: pasta at $6.00 for 1 kg, or at $2.60 for 500 g?

Answer: $2.60 for 500 g ($0.52 per 100 g)

  1. First: $6.00 ÷ 10 = $0.60 per 100 g
  2. Second: $2.60 ÷ 5 = $0.52 per 100 g
  3. The cheaper unit price is better value.
5.Which is better value: juice at $2.20 for 1 L, or at $3.00 for 2 L?

Answer: $3.00 for 2 L ($0.15 per 100 mL)

  1. First: $2.20 ÷ 10 = $0.22 per 100 mL
  2. Second: $3.00 ÷ 20 = $0.15 per 100 mL
  3. The cheaper unit price is better value.
6.Which is better value: oats at $3.00 for 1 kg, or at $9.00 for 2 kg?

Answer: $3.00 for 1 kg ($0.30 per 100 g)

  1. First: $3.00 ÷ 10 = $0.30 per 100 g
  2. Second: $9.00 ÷ 20 = $0.45 per 100 g
  3. The cheaper unit price is better value.
7.Which is better value: juice at $4.00 for 2 L, or at $3.20 for 1 L?

Answer: $4.00 for 2 L ($0.20 per 100 mL)

  1. First: $4.00 ÷ 20 = $0.20 per 100 mL
  2. Second: $3.20 ÷ 10 = $0.32 per 100 mL
  3. The cheaper unit price is better value.
8.Which is better value: juice at $8.60 for 1 L, or at $20.40 for 2 L?

Answer: $8.60 for 1 L ($0.86 per 100 mL)

  1. First: $8.60 ÷ 10 = $0.86 per 100 mL
  2. Second: $20.40 ÷ 20 = $1.02 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: