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Year 7 Best Buys and Unit Prices Worksheet — Level 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 — 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 $4.25 for 500 g, or at $7.60 for 1 kg?

Answer: $7.60 for 1 kg ($0.76 per 100 g)

  1. First: $4.25 ÷ 5 = $0.85 per 100 g
  2. Second: $7.60 ÷ 10 = $0.76 per 100 g
  3. The cheaper unit price is better value.
2.Which is better value: rice at $5.10 for 1 kg, or at $3.35 for 500 g?

Answer: $5.10 for 1 kg ($0.51 per 100 g)

  1. First: $5.10 ÷ 10 = $0.51 per 100 g
  2. Second: $3.35 ÷ 5 = $0.67 per 100 g
  3. The cheaper unit price is better value.
3.Which is better value: pasta at $0.50 for 250 g, or at $0.35 for 500 g?

Answer: $0.35 for 500 g ($0.07 per 100 g)

  1. First: $0.50 ÷ 2.5 = $0.20 per 100 g
  2. Second: $0.35 ÷ 5 = $0.07 per 100 g
  3. The cheaper unit price is better value.
4.Which is better value: rice at $3.30 for 1 kg, or at $7.60 for 2 kg?

Answer: $3.30 for 1 kg ($0.33 per 100 g)

  1. First: $3.30 ÷ 10 = $0.33 per 100 g
  2. Second: $7.60 ÷ 20 = $0.38 per 100 g
  3. The cheaper unit price is better value.
5.Which is better value: rice at $8.70 for 1 kg, or at $4.05 for 500 g?

Answer: $4.05 for 500 g ($0.81 per 100 g)

  1. First: $8.70 ÷ 10 = $0.87 per 100 g
  2. Second: $4.05 ÷ 5 = $0.81 per 100 g
  3. The cheaper unit price is better value.
6.Which is better value: juice at $12.00 for 2 L, or at $5.80 for 1 L?

Answer: $5.80 for 1 L ($0.58 per 100 mL)

  1. First: $12.00 ÷ 20 = $0.60 per 100 mL
  2. Second: $5.80 ÷ 10 = $0.58 per 100 mL
  3. The cheaper unit price is better value.
7.Which is better value: pasta at $6.80 for 1 kg, or at $4.10 for 500 g?

Answer: $6.80 for 1 kg ($0.68 per 100 g)

  1. First: $6.80 ÷ 10 = $0.68 per 100 g
  2. Second: $4.10 ÷ 5 = $0.82 per 100 g
  3. The cheaper unit price is better value.
8.Which is better value: pasta at $8.90 for 1 kg, or at $4.15 for 500 g?

Answer: $4.15 for 500 g ($0.83 per 100 g)

  1. First: $8.90 ÷ 10 = $0.89 per 100 g
  2. Second: $4.15 ÷ 5 = $0.83 per 100 g
  3. The cheaper unit price is better value.
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