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Year 7 Best Buys and Unit Prices Worksheet — Level 3 — Practice Set 3 — Answers

Answer sheet with worked solutions for the Year 7 ratio & rates worksheet.

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Success TutoringWorksheetsAnswer sheetYear 7 · Mathematics · Ratio & Rates

Year 7 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: oats at $13.60 for 2 kg, or at $5.40 for 1 kg?

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

  1. First: $13.60 ÷ 20 = $0.68 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: pencils at $12.00 for a pack of 24, or at $3.18 for a pack of 6?

Answer: $12.00 for a pack of 24 ($0.50 per pencil)

  1. First: $12.00 ÷ 24 = $0.50 per pencil
  2. Second: $3.18 ÷ 6 = $0.53 per pencil
  3. The cheaper unit price is better value.
3.Which is better value: pencils at $3.90 for a pack of 6, or at $19.68 for a pack of 24?

Answer: $3.90 for a pack of 6 ($0.65 per pencil)

  1. First: $3.90 ÷ 6 = $0.65 per pencil
  2. Second: $19.68 ÷ 24 = $0.82 per pencil
  3. The cheaper unit price is better value.
4.Which is better value: oats at $4.00 for 1 kg, or at $1.85 for 500 g?

Answer: $1.85 for 500 g ($0.37 per 100 g)

  1. First: $4.00 ÷ 10 = $0.40 per 100 g
  2. Second: $1.85 ÷ 5 = $0.37 per 100 g
  3. The cheaper unit price is better value.
5.Which is better value: rice at $1.45 for 500 g, or at $2.10 for 1 kg?

Answer: $2.10 for 1 kg ($0.21 per 100 g)

  1. First: $1.45 ÷ 5 = $0.29 per 100 g
  2. Second: $2.10 ÷ 10 = $0.21 per 100 g
  3. The cheaper unit price is better value.
6.Which is better value: rice at $6.40 for 2 kg, or at $1.40 for 500 g?

Answer: $1.40 for 500 g ($0.28 per 100 g)

  1. First: $6.40 ÷ 20 = $0.32 per 100 g
  2. Second: $1.40 ÷ 5 = $0.28 per 100 g
  3. The cheaper unit price is better value.
7.Which is better value: pencils at $7.32 for a pack of 12, or at $18.00 for a pack of 24?

Answer: $7.32 for a pack of 12 ($0.61 per pencil)

  1. First: $7.32 ÷ 12 = $0.61 per pencil
  2. Second: $18.00 ÷ 24 = $0.75 per pencil
  3. The cheaper unit price is better value.
8.Which is better value: juice at $3.90 for 1 L, or at $8.80 for 2 L?

Answer: $3.90 for 1 L ($0.39 per 100 mL)

  1. First: $3.90 ÷ 10 = $0.39 per 100 mL
  2. Second: $8.80 ÷ 20 = $0.44 per 100 mL
  3. The cheaper unit price is better value.
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