Year 9 Best Buys and Unit Prices Worksheet — Level 2 — Practice Set 3 — Answers
Answer sheet with worked solutions for the Year 9 ratio & rates worksheet.
Success TutoringWorksheetsAnswer sheetYear 9 · Mathematics · Ratio & RatesYear 9 Best Buys and Unit Prices Worksheet — Level 2 — 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: pencils at $5.76 for a pack of 24, or at $1.80 for a pack of 12?
Answer: $1.80 for a pack of 12 ($0.15 per pencil)
- First: $5.76 ÷ 24 = $0.24 per pencil
- Second: $1.80 ÷ 12 = $0.15 per pencil
- The cheaper unit price is better value.
2.Which is better value: pencils at $12.24 for a pack of 24, or at $4.32 for a pack of 12?
Answer: $4.32 for a pack of 12 ($0.36 per pencil)
- First: $12.24 ÷ 24 = $0.51 per pencil
- Second: $4.32 ÷ 12 = $0.36 per pencil
- The cheaper unit price is better value.
3.Which is better value: pasta at $6.80 for 1 kg, or at $1.55 for 250 g?
Answer: $1.55 for 250 g ($0.62 per 100 g)
- First: $6.80 ÷ 10 = $0.68 per 100 g
- Second: $1.55 ÷ 2.5 = $0.62 per 100 g
- The cheaper unit price is better value.
4.Which is better value: oats at $7.60 for 1 kg, or at $4.45 for 500 g?
Answer: $7.60 for 1 kg ($0.76 per 100 g)
- First: $7.60 ÷ 10 = $0.76 per 100 g
- Second: $4.45 ÷ 5 = $0.89 per 100 g
- The cheaper unit price is better value.
5.Which is better value: pencils at $11.52 for a pack of 24, or at $7.32 for a pack of 12?
Answer: $11.52 for a pack of 24 ($0.48 per pencil)
- First: $11.52 ÷ 24 = $0.48 per pencil
- Second: $7.32 ÷ 12 = $0.61 per pencil
- The cheaper unit price is better value.
6.Which is better value: pencils at $20.40 for a pack of 24, or at $5.82 for a pack of 6?
Answer: $20.40 for a pack of 24 ($0.85 per pencil)
- First: $20.40 ÷ 24 = $0.85 per pencil
- Second: $5.82 ÷ 6 = $0.97 per pencil
- The cheaper unit price is better value.
7.Which is better value: pasta at $0.85 for 500 g, or at $2.70 for 1 kg?
Answer: $0.85 for 500 g ($0.17 per 100 g)
- First: $0.85 ÷ 5 = $0.17 per 100 g
- Second: $2.70 ÷ 10 = $0.27 per 100 g
- The cheaper unit price is better value.
8.Which is better value: pencils at $13.92 for a pack of 24, or at $2.70 for a pack of 6?
Answer: $2.70 for a pack of 6 ($0.45 per pencil)
- First: $13.92 ÷ 24 = $0.58 per pencil
- Second: $2.70 ÷ 6 = $0.45 per pencil
- The cheaper unit price is better value.
Marking tips
- Give credit for correct method even when the final answer slips — the working shows where the thinking went right.
- For open-ended tasks, use the success criteria as a checklist rather than looking for one "right" answer.
- Celebrate what went well first, then pick one thing to work on next.