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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: oats at $2.25 for 500 g, or at $10.60 for 2 kg?

Answer: $2.25 for 500 g ($0.45 per 100 g)

  1. First: $2.25 ÷ 5 = $0.45 per 100 g
  2. Second: $10.60 ÷ 20 = $0.53 per 100 g
  3. The cheaper unit price is better value.
2.Which is better value: oats at $5.30 for 1 kg, or at $9.20 for 2 kg?

Answer: $9.20 for 2 kg ($0.46 per 100 g)

  1. First: $5.30 ÷ 10 = $0.53 per 100 g
  2. Second: $9.20 ÷ 20 = $0.46 per 100 g
  3. The cheaper unit price is better value.
3.Which is better value: oats at $14.60 for 2 kg, or at $8.80 for 1 kg?

Answer: $14.60 for 2 kg ($0.73 per 100 g)

  1. First: $14.60 ÷ 20 = $0.73 per 100 g
  2. Second: $8.80 ÷ 10 = $0.88 per 100 g
  3. The cheaper unit price is better value.
4.Which is better value: pencils at $10.80 for a pack of 12, or at $23.76 for a pack of 24?

Answer: $10.80 for a pack of 12 ($0.90 per pencil)

  1. First: $10.80 ÷ 12 = $0.90 per pencil
  2. Second: $23.76 ÷ 24 = $0.99 per pencil
  3. The cheaper unit price is better value.
5.Which is better value: pasta at $3.90 for 500 g, or at $1.80 for 250 g?

Answer: $1.80 for 250 g ($0.72 per 100 g)

  1. First: $3.90 ÷ 5 = $0.78 per 100 g
  2. Second: $1.80 ÷ 2.5 = $0.72 per 100 g
  3. The cheaper unit price is better value.
6.Which is better value: oats at $2.80 for 1 kg, or at $1.60 for 500 g?

Answer: $2.80 for 1 kg ($0.28 per 100 g)

  1. First: $2.80 ÷ 10 = $0.28 per 100 g
  2. Second: $1.60 ÷ 5 = $0.32 per 100 g
  3. The cheaper unit price is better value.
7.Which is better value: oats at $8.80 for 1 kg, or at $3.95 for 500 g?

Answer: $3.95 for 500 g ($0.79 per 100 g)

  1. First: $8.80 ÷ 10 = $0.88 per 100 g
  2. Second: $3.95 ÷ 5 = $0.79 per 100 g
  3. The cheaper unit price is better value.
8.Which is better value: juice at $0.90 for 250 mL, or at $4.00 for 2 L?

Answer: $4.00 for 2 L ($0.20 per 100 mL)

  1. First: $0.90 ÷ 2.5 = $0.36 per 100 mL
  2. Second: $4.00 ÷ 20 = $0.20 per 100 mL
  3. The cheaper unit price is better value.
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