Year 9 Best Buys and Unit Prices Worksheet — Level 2 — Practice Set 4 — 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 4 — Answers
Find the price for the same amount of each (the unit price), then compare. Show your working.
1.Which is better value: rice at $14.00 for 2 kg, or at $4.25 for 500 g?
Answer: $14.00 for 2 kg ($0.70 per 100 g)
- First: $14.00 ÷ 20 = $0.70 per 100 g
- Second: $4.25 ÷ 5 = $0.85 per 100 g
- The cheaper unit price is better value.
2.Which is better value: pencils at $2.76 for a pack of 12, or at $3.36 for a pack of 24?
Answer: $3.36 for a pack of 24 ($0.14 per pencil)
- First: $2.76 ÷ 12 = $0.23 per pencil
- Second: $3.36 ÷ 24 = $0.14 per pencil
- The cheaper unit price is better value.
3.Which is better value: pencils at $8.40 for a pack of 24, or at $2.52 for a pack of 12?
Answer: $2.52 for a pack of 12 ($0.21 per pencil)
- First: $8.40 ÷ 24 = $0.35 per pencil
- Second: $2.52 ÷ 12 = $0.21 per pencil
- The cheaper unit price is better value.
4.Which is better value: pencils at $2.52 for a pack of 12, or at $2.34 for a pack of 6?
Answer: $2.52 for a pack of 12 ($0.21 per pencil)
- First: $2.52 ÷ 12 = $0.21 per pencil
- Second: $2.34 ÷ 6 = $0.39 per pencil
- The cheaper unit price is better value.
5.Which is better value: pencils at $2.82 for a pack of 6, or at $6.24 for a pack of 12?
Answer: $2.82 for a pack of 6 ($0.47 per pencil)
- First: $2.82 ÷ 6 = $0.47 per pencil
- Second: $6.24 ÷ 12 = $0.52 per pencil
- The cheaper unit price is better value.
6.Which is better value: oats at $4.20 for 2 kg, or at $0.60 for 500 g?
Answer: $0.60 for 500 g ($0.12 per 100 g)
- First: $4.20 ÷ 20 = $0.21 per 100 g
- Second: $0.60 ÷ 5 = $0.12 per 100 g
- The cheaper unit price is better value.
7.Which is better value: rice at $7.40 for 1 kg, or at $3.20 for 500 g?
Answer: $3.20 for 500 g ($0.64 per 100 g)
- First: $7.40 ÷ 10 = $0.74 per 100 g
- Second: $3.20 ÷ 5 = $0.64 per 100 g
- The cheaper unit price is better value.
8.Which is better value: pasta at $2.30 for 1 kg, or at $0.25 for 250 g?
Answer: $0.25 for 250 g ($0.10 per 100 g)
- First: $2.30 ÷ 10 = $0.23 per 100 g
- Second: $0.25 ÷ 2.5 = $0.10 per 100 g
- 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.