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 $1.05 for 500 g, or at $5.20 for 2 kg?
Answer: $1.05 for 500 g ($0.21 per 100 g)
- First: $1.05 ÷ 5 = $0.21 per 100 g
- Second: $5.20 ÷ 20 = $0.26 per 100 g
- The cheaper unit price is better value.
2.Which is better value: rice at $8.60 for 1 kg, or at $20.20 for 2 kg?
Answer: $8.60 for 1 kg ($0.86 per 100 g)
- First: $8.60 ÷ 10 = $0.86 per 100 g
- Second: $20.20 ÷ 20 = $1.01 per 100 g
- The cheaper unit price is better value.
3.Which is better value: pasta at $6.30 for 1 kg, or at $2.55 for 500 g?
Answer: $2.55 for 500 g ($0.51 per 100 g)
- First: $6.30 ÷ 10 = $0.63 per 100 g
- Second: $2.55 ÷ 5 = $0.51 per 100 g
- The cheaper unit price is better value.
4.Which is better value: juice at $2.05 for 250 mL, or at $12.40 for 2 L?
Answer: $12.40 for 2 L ($0.62 per 100 mL)
- First: $2.05 ÷ 2.5 = $0.82 per 100 mL
- Second: $12.40 ÷ 20 = $0.62 per 100 mL
- The cheaper unit price is better value.
5.Which is better value: rice at $4.40 for 500 g, or at $10.80 for 1 kg?
Answer: $4.40 for 500 g ($0.88 per 100 g)
- First: $4.40 ÷ 5 = $0.88 per 100 g
- Second: $10.80 ÷ 10 = $1.08 per 100 g
- The cheaper unit price is better value.
6.Which is better value: oats 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.
7.Which is better value: oats at $1.80 for 500 g, or at $9.20 for 2 kg?
Answer: $1.80 for 500 g ($0.36 per 100 g)
- First: $1.80 ÷ 5 = $0.36 per 100 g
- Second: $9.20 ÷ 20 = $0.46 per 100 g
- The cheaper unit price is better value.
8.Which is better value: pencils at $7.68 for a pack of 12, or at $2.88 for a pack of 6?
Answer: $2.88 for a pack of 6 ($0.48 per pencil)
- First: $7.68 ÷ 12 = $0.64 per pencil
- Second: $2.88 ÷ 6 = $0.48 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.