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Year 9 Best Buys and Unit Prices Worksheet — Level 3 — Practice Set 2 — Answers

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

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Success TutoringWorksheetsAnswer sheetYear 9 · Mathematics · Ratio & Rates

Year 9 Best Buys and Unit Prices Worksheet — Level 3 — Practice Set 2 — 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 $3.55 for 500 g, or at $7.40 for 1 kg?

Answer: $3.55 for 500 g ($0.71 per 100 g)

  1. First: $3.55 ÷ 5 = $0.71 per 100 g
  2. Second: $7.40 ÷ 10 = $0.74 per 100 g
  3. The cheaper unit price is better value.
2.Which is better value: rice at $3.20 for 2 kg, or at $1.60 for 500 g?

Answer: $3.20 for 2 kg ($0.16 per 100 g)

  1. First: $3.20 ÷ 20 = $0.16 per 100 g
  2. Second: $1.60 ÷ 5 = $0.32 per 100 g
  3. The cheaper unit price is better value.
3.Which is better value: pencils at $2.46 for a pack of 6, or at $6.72 for a pack of 24?

Answer: $6.72 for a pack of 24 ($0.28 per pencil)

  1. First: $2.46 ÷ 6 = $0.41 per pencil
  2. Second: $6.72 ÷ 24 = $0.28 per pencil
  3. The cheaper unit price is better value.
4.Which is better value: juice at $1.60 for 250 mL, or at $13.60 for 2 L?

Answer: $1.60 for 250 mL ($0.64 per 100 mL)

  1. First: $1.60 ÷ 2.5 = $0.64 per 100 mL
  2. Second: $13.60 ÷ 20 = $0.68 per 100 mL
  3. The cheaper unit price is better value.
5.Which is better value: juice at $0.80 for 250 mL, or at $9.00 for 2 L?

Answer: $0.80 for 250 mL ($0.32 per 100 mL)

  1. First: $0.80 ÷ 2.5 = $0.32 per 100 mL
  2. Second: $9.00 ÷ 20 = $0.45 per 100 mL
  3. The cheaper unit price is better value.
6.Which is better value: oats at $13.40 for 2 kg, or at $5.00 for 1 kg?

Answer: $5.00 for 1 kg ($0.50 per 100 g)

  1. First: $13.40 ÷ 20 = $0.67 per 100 g
  2. Second: $5.00 ÷ 10 = $0.50 per 100 g
  3. The cheaper unit price is better value.
7.Which is better value: oats at $6.40 for 2 kg, or at $2.05 for 500 g?

Answer: $6.40 for 2 kg ($0.32 per 100 g)

  1. First: $6.40 ÷ 20 = $0.32 per 100 g
  2. Second: $2.05 ÷ 5 = $0.41 per 100 g
  3. The cheaper unit price is better value.
8.Which is better value: pencils at $3.00 for a pack of 12, or at $4.32 for a pack of 24?

Answer: $4.32 for a pack of 24 ($0.18 per pencil)

  1. First: $3.00 ÷ 12 = $0.25 per pencil
  2. Second: $4.32 ÷ 24 = $0.18 per pencil
  3. The cheaper unit price is better value.
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