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

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

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Success TutoringWorksheetsAnswer sheetYear 8 · Mathematics · Ratio & Rates

Year 8 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: oats at $8.10 for 1 kg, or at $4.40 for 500 g?

Answer: $8.10 for 1 kg ($0.81 per 100 g)

  1. First: $8.10 ÷ 10 = $0.81 per 100 g
  2. Second: $4.40 ÷ 5 = $0.88 per 100 g
  3. The cheaper unit price is better value.
2.Which is better value: juice at $1.55 for 250 mL, or at $13.60 for 2 L?

Answer: $1.55 for 250 mL ($0.62 per 100 mL)

  1. First: $1.55 ÷ 2.5 = $0.62 per 100 mL
  2. Second: $13.60 ÷ 20 = $0.68 per 100 mL
  3. The cheaper unit price is better value.
3.Which is better value: oats at $4.10 for 1 kg, or at $9.00 for 2 kg?

Answer: $4.10 for 1 kg ($0.41 per 100 g)

  1. First: $4.10 ÷ 10 = $0.41 per 100 g
  2. Second: $9.00 ÷ 20 = $0.45 per 100 g
  3. The cheaper unit price is better value.
4.Which is better value: pencils at $9.84 for a pack of 12, or at $21.84 for a pack of 24?

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

  1. First: $9.84 ÷ 12 = $0.82 per pencil
  2. Second: $21.84 ÷ 24 = $0.91 per pencil
  3. The cheaper unit price is better value.
5.Which is better value: pencils at $1.44 for a pack of 6, or at $5.04 for a pack of 12?

Answer: $1.44 for a pack of 6 ($0.24 per pencil)

  1. First: $1.44 ÷ 6 = $0.24 per pencil
  2. Second: $5.04 ÷ 12 = $0.42 per pencil
  3. The cheaper unit price is better value.
6.Which is better value: pasta at $8.30 for 1 kg, or at $4.85 for 500 g?

Answer: $8.30 for 1 kg ($0.83 per 100 g)

  1. First: $8.30 ÷ 10 = $0.83 per 100 g
  2. Second: $4.85 ÷ 5 = $0.97 per 100 g
  3. The cheaper unit price is better value.
7.Which is better value: pencils at $1.02 for a pack of 6, or at $3.24 for a pack of 12?

Answer: $1.02 for a pack of 6 ($0.17 per pencil)

  1. First: $1.02 ÷ 6 = $0.17 per pencil
  2. Second: $3.24 ÷ 12 = $0.27 per pencil
  3. The cheaper unit price is better value.
8.Which is better value: oats at $16.80 for 2 kg, or at $7.90 for 1 kg?

Answer: $7.90 for 1 kg ($0.79 per 100 g)

  1. First: $16.80 ÷ 20 = $0.84 per 100 g
  2. Second: $7.90 ÷ 10 = $0.79 per 100 g
  3. The cheaper unit price is better value.
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