Year 9 Best Buys and Unit Prices Worksheet — Level 2 — Practice Set 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 — Practice Set 2 — 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 $2.90 for 500 g, or at $6.80 for 1 kg?
Answer: $2.90 for 500 g ($0.58 per 100 g)
- First: $2.90 ÷ 5 = $0.58 per 100 g
- Second: $6.80 ÷ 10 = $0.68 per 100 g
- The cheaper unit price is better value.
2.Which is better value: juice at $8.60 for 2 L, or at $0.85 for 250 mL?
Answer: $0.85 for 250 mL ($0.34 per 100 mL)
- First: $8.60 ÷ 20 = $0.43 per 100 mL
- Second: $0.85 ÷ 2.5 = $0.34 per 100 mL
- The cheaper unit price is better value.
3.Which is better value: rice at $4.40 for 500 g, or at $7.50 for 1 kg?
Answer: $7.50 for 1 kg ($0.75 per 100 g)
- First: $4.40 ÷ 5 = $0.88 per 100 g
- Second: $7.50 ÷ 10 = $0.75 per 100 g
- The cheaper unit price is better value.
4.Which is better value: pasta at $2.95 for 500 g, or at $7.60 for 1 kg?
Answer: $2.95 for 500 g ($0.59 per 100 g)
- First: $2.95 ÷ 5 = $0.59 per 100 g
- Second: $7.60 ÷ 10 = $0.76 per 100 g
- The cheaper unit price is better value.
5.Which is better value: oats at $12.60 for 2 kg, or at $2.50 for 500 g?
Answer: $2.50 for 500 g ($0.50 per 100 g)
- First: $12.60 ÷ 20 = $0.63 per 100 g
- Second: $2.50 ÷ 5 = $0.50 per 100 g
- The cheaper unit price is better value.
6.Which is better value: rice at $7.70 for 1 kg, or at $14.20 for 2 kg?
Answer: $14.20 for 2 kg ($0.71 per 100 g)
- First: $7.70 ÷ 10 = $0.77 per 100 g
- Second: $14.20 ÷ 20 = $0.71 per 100 g
- The cheaper unit price is better value.
7.Which is better value: pencils at $10.80 for a pack of 12, or at $25.68 for a pack of 24?
Answer: $10.80 for a pack of 12 ($0.90 per pencil)
- First: $10.80 ÷ 12 = $0.90 per pencil
- Second: $25.68 ÷ 24 = $1.07 per pencil
- The cheaper unit price is better value.
8.Which is better value: rice at $7.30 for 1 kg, or at $2.95 for 500 g?
Answer: $2.95 for 500 g ($0.59 per 100 g)
- First: $7.30 ÷ 10 = $0.73 per 100 g
- Second: $2.95 ÷ 5 = $0.59 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.