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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: pasta at $0.80 for 250 g, or at $5.00 for 1 kg?

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

  1. First: $0.80 ÷ 2.5 = $0.32 per 100 g
  2. Second: $5.00 ÷ 10 = $0.50 per 100 g
  3. The cheaper unit price is better value.
2.Which is better value: juice at $15.00 for 2 L, or at $8.50 for 1 L?

Answer: $15.00 for 2 L ($0.75 per 100 mL)

  1. First: $15.00 ÷ 20 = $0.75 per 100 mL
  2. Second: $8.50 ÷ 10 = $0.85 per 100 mL
  3. The cheaper unit price is better value.
3.Which is better value: rice at $2.50 for 1 kg, or at $2.40 for 2 kg?

Answer: $2.40 for 2 kg ($0.12 per 100 g)

  1. First: $2.50 ÷ 10 = $0.25 per 100 g
  2. Second: $2.40 ÷ 20 = $0.12 per 100 g
  3. The cheaper unit price is better value.
4.Which is better value: rice at $6.30 for 1 kg, or at $3.05 for 500 g?

Answer: $3.05 for 500 g ($0.61 per 100 g)

  1. First: $6.30 ÷ 10 = $0.63 per 100 g
  2. Second: $3.05 ÷ 5 = $0.61 per 100 g
  3. The cheaper unit price is better value.
5.Which is better value: oats at $14.20 for 2 kg, or at $5.40 for 1 kg?

Answer: $5.40 for 1 kg ($0.54 per 100 g)

  1. First: $14.20 ÷ 20 = $0.71 per 100 g
  2. Second: $5.40 ÷ 10 = $0.54 per 100 g
  3. The cheaper unit price is better value.
6.Which is better value: oats at $2.10 for 1 kg, or at $0.75 for 500 g?

Answer: $0.75 for 500 g ($0.15 per 100 g)

  1. First: $2.10 ÷ 10 = $0.21 per 100 g
  2. Second: $0.75 ÷ 5 = $0.15 per 100 g
  3. The cheaper unit price is better value.
7.Which is better value: oats at $3.80 for 500 g, or at $16.80 for 2 kg?

Answer: $3.80 for 500 g ($0.76 per 100 g)

  1. First: $3.80 ÷ 5 = $0.76 per 100 g
  2. Second: $16.80 ÷ 20 = $0.84 per 100 g
  3. The cheaper unit price is better value.
8.Which is better value: rice at $16.40 for 2 kg, or at $3.10 for 500 g?

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

  1. First: $16.40 ÷ 20 = $0.82 per 100 g
  2. Second: $3.10 ÷ 5 = $0.62 per 100 g
  3. The cheaper unit price is better value.
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