Year 9 Best Buys and Unit Prices Worksheet — Level 2 — 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 — Answers
Find the price for the same amount of each (the unit price), then compare. Show your working.
1.Which is better value: juice at $1.50 for 250 mL, or at $9.60 for 2 L?
Answer: $9.60 for 2 L ($0.48 per 100 mL)
- First: $1.50 ÷ 2.5 = $0.60 per 100 mL
- Second: $9.60 ÷ 20 = $0.48 per 100 mL
- The cheaper unit price is better value.
2.Which is better value: rice at $12.80 for 2 kg, or at $5.90 for 1 kg?
Answer: $5.90 for 1 kg ($0.59 per 100 g)
- First: $12.80 ÷ 20 = $0.64 per 100 g
- Second: $5.90 ÷ 10 = $0.59 per 100 g
- The cheaper unit price is better value.
3.Which is better value: rice at $2.55 for 500 g, or at $6.70 for 1 kg?
Answer: $2.55 for 500 g ($0.51 per 100 g)
- First: $2.55 ÷ 5 = $0.51 per 100 g
- Second: $6.70 ÷ 10 = $0.67 per 100 g
- The cheaper unit price is better value.
4.Which is better value: oats at $7.20 for 2 kg, or at $2.90 for 1 kg?
Answer: $2.90 for 1 kg ($0.29 per 100 g)
- First: $7.20 ÷ 20 = $0.36 per 100 g
- Second: $2.90 ÷ 10 = $0.29 per 100 g
- The cheaper unit price is better value.
5.Which is better value: pencils at $2.40 for a pack of 12, or at $7.20 for a pack of 24?
Answer: $2.40 for a pack of 12 ($0.20 per pencil)
- First: $2.40 ÷ 12 = $0.20 per pencil
- Second: $7.20 ÷ 24 = $0.30 per pencil
- The cheaper unit price is better value.
6.Which is better value: pasta at $0.65 for 250 g, or at $2.10 for 500 g?
Answer: $0.65 for 250 g ($0.26 per 100 g)
- First: $0.65 ÷ 2.5 = $0.26 per 100 g
- Second: $2.10 ÷ 5 = $0.42 per 100 g
- The cheaper unit price is better value.
7.Which is better value: oats at $11.60 for 2 kg, or at $6.30 for 1 kg?
Answer: $11.60 for 2 kg ($0.58 per 100 g)
- First: $11.60 ÷ 20 = $0.58 per 100 g
- Second: $6.30 ÷ 10 = $0.63 per 100 g
- The cheaper unit price is better value.
8.Which is better value: pasta at $4.10 for 1 kg, or at $1.65 for 500 g?
Answer: $1.65 for 500 g ($0.33 per 100 g)
- First: $4.10 ÷ 10 = $0.41 per 100 g
- Second: $1.65 ÷ 5 = $0.33 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.