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Year 9 Best Buys and Unit Prices Worksheet — Level 3 — 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 — 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 $15.80 for 2 kg, or at $8.10 for 1 kg?

Answer: $15.80 for 2 kg ($0.79 per 100 g)

  1. First: $15.80 ÷ 20 = $0.79 per 100 g
  2. Second: $8.10 ÷ 10 = $0.81 per 100 g
  3. The cheaper unit price is better value.
2.Which is better value: pencils at $8.64 for a pack of 12, or at $18.48 for a pack of 24?

Answer: $8.64 for a pack of 12 ($0.72 per pencil)

  1. First: $8.64 ÷ 12 = $0.72 per pencil
  2. Second: $18.48 ÷ 24 = $0.77 per pencil
  3. The cheaper unit price is better value.
3.Which is better value: pencils at $3.54 for a pack of 6, or at $6.12 for a pack of 12?

Answer: $6.12 for a pack of 12 ($0.51 per pencil)

  1. First: $3.54 ÷ 6 = $0.59 per pencil
  2. Second: $6.12 ÷ 12 = $0.51 per pencil
  3. The cheaper unit price is better value.
4.Which is better value: pasta at $0.55 for 250 g, or at $0.80 for 1 kg?

Answer: $0.80 for 1 kg ($0.08 per 100 g)

  1. First: $0.55 ÷ 2.5 = $0.22 per 100 g
  2. Second: $0.80 ÷ 10 = $0.08 per 100 g
  3. The cheaper unit price is better value.
5.Which is better value: pencils at $2.76 for a pack of 12, or at $2.52 for a pack of 6?

Answer: $2.76 for a pack of 12 ($0.23 per pencil)

  1. First: $2.76 ÷ 12 = $0.23 per pencil
  2. Second: $2.52 ÷ 6 = $0.42 per pencil
  3. The cheaper unit price is better value.
6.Which is better value: oats at $12.00 for 2 kg, or at $2.35 for 500 g?

Answer: $2.35 for 500 g ($0.47 per 100 g)

  1. First: $12.00 ÷ 20 = $0.60 per 100 g
  2. Second: $2.35 ÷ 5 = $0.47 per 100 g
  3. The cheaper unit price is better value.
7.Which is better value: pasta at $5.60 for 1 kg, or at $2.35 for 500 g?

Answer: $2.35 for 500 g ($0.47 per 100 g)

  1. First: $5.60 ÷ 10 = $0.56 per 100 g
  2. Second: $2.35 ÷ 5 = $0.47 per 100 g
  3. The cheaper unit price is better value.
8.Which is better value: pencils at $4.80 for a pack of 24, or at $4.44 for a pack of 12?

Answer: $4.80 for a pack of 24 ($0.20 per pencil)

  1. First: $4.80 ÷ 24 = $0.20 per pencil
  2. Second: $4.44 ÷ 12 = $0.37 per pencil
  3. The cheaper unit price is better value.
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