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 $1.70 for 500 g, or at $4.80 for 1 kg?
Answer: $1.70 for 500 g ($0.34 per 100 g)
- First: $1.70 ÷ 5 = $0.34 per 100 g
- Second: $4.80 ÷ 10 = $0.48 per 100 g
- The cheaper unit price is better value.
2.Which is better value: pencils at $6.00 for a pack of 12, or at $3.66 for a pack of 6?
Answer: $6.00 for a pack of 12 ($0.50 per pencil)
- First: $6.00 ÷ 12 = $0.50 per pencil
- Second: $3.66 ÷ 6 = $0.61 per pencil
- The cheaper unit price is better value.
3.Which is better value: oats at $3.60 for 2 kg, or at $1.60 for 500 g?
Answer: $3.60 for 2 kg ($0.18 per 100 g)
- First: $3.60 ÷ 20 = $0.18 per 100 g
- Second: $1.60 ÷ 5 = $0.32 per 100 g
- The cheaper unit price is better value.
4.Which is better value: pasta at $1.80 for 500 g, or at $5.50 for 1 kg?
Answer: $1.80 for 500 g ($0.36 per 100 g)
- First: $1.80 ÷ 5 = $0.36 per 100 g
- Second: $5.50 ÷ 10 = $0.55 per 100 g
- The cheaper unit price is better value.
5.Which is better value: pencils at $5.10 for a pack of 6, or at $12.24 for a pack of 12?
Answer: $5.10 for a pack of 6 ($0.85 per pencil)
- First: $5.10 ÷ 6 = $0.85 per pencil
- Second: $12.24 ÷ 12 = $1.02 per pencil
- The cheaper unit price is better value.
6.Which is better value: oats at $5.40 for 1 kg, or at $2.00 for 500 g?
Answer: $2.00 for 500 g ($0.40 per 100 g)
- First: $5.40 ÷ 10 = $0.54 per 100 g
- Second: $2.00 ÷ 5 = $0.40 per 100 g
- The cheaper unit price is better value.
7.Which is better value: rice at $2.00 for 1 kg, or at $1.60 for 500 g?
Answer: $2.00 for 1 kg ($0.20 per 100 g)
- First: $2.00 ÷ 10 = $0.20 per 100 g
- Second: $1.60 ÷ 5 = $0.32 per 100 g
- The cheaper unit price is better value.
8.Which is better value: pasta at $1.65 for 250 g, or at $8.20 for 1 kg?
Answer: $1.65 for 250 g ($0.66 per 100 g)
- First: $1.65 ÷ 2.5 = $0.66 per 100 g
- Second: $8.20 ÷ 10 = $0.82 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.