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: juice at $16.40 for 2 L, or at $6.70 for 1 L?
Answer: $6.70 for 1 L ($0.67 per 100 mL)
- First: $16.40 ÷ 20 = $0.82 per 100 mL
- Second: $6.70 ÷ 10 = $0.67 per 100 mL
- The cheaper unit price is better value.
2.Which is better value: oats at $7.40 for 1 kg, or at $11.20 for 2 kg?
Answer: $11.20 for 2 kg ($0.56 per 100 g)
- First: $7.40 ÷ 10 = $0.74 per 100 g
- Second: $11.20 ÷ 20 = $0.56 per 100 g
- The cheaper unit price is better value.
3.Which is better value: pasta at $3.80 for 1 kg, or at $1.35 for 250 g?
Answer: $3.80 for 1 kg ($0.38 per 100 g)
- First: $3.80 ÷ 10 = $0.38 per 100 g
- Second: $1.35 ÷ 2.5 = $0.54 per 100 g
- The cheaper unit price is better value.
4.Which is better value: oats at $8.50 for 1 kg, or at $4.80 for 500 g?
Answer: $8.50 for 1 kg ($0.85 per 100 g)
- First: $8.50 ÷ 10 = $0.85 per 100 g
- Second: $4.80 ÷ 5 = $0.96 per 100 g
- The cheaper unit price is better value.
5.Which is better value: rice at $7.60 for 2 kg, or at $0.95 for 500 g?
Answer: $0.95 for 500 g ($0.19 per 100 g)
- First: $7.60 ÷ 20 = $0.38 per 100 g
- Second: $0.95 ÷ 5 = $0.19 per 100 g
- The cheaper unit price is better value.
6.Which is better value: pasta at $7.20 for 1 kg, or at $1.40 for 250 g?
Answer: $1.40 for 250 g ($0.56 per 100 g)
- First: $7.20 ÷ 10 = $0.72 per 100 g
- Second: $1.40 ÷ 2.5 = $0.56 per 100 g
- The cheaper unit price is better value.
7.Which is better value: pasta at $2.15 for 500 g, or at $6.00 for 1 kg?
Answer: $2.15 for 500 g ($0.43 per 100 g)
- First: $2.15 ÷ 5 = $0.43 per 100 g
- Second: $6.00 ÷ 10 = $0.60 per 100 g
- The cheaper unit price is better value.
8.Which is better value: oats at $12.80 for 2 kg, or at $3.75 for 500 g?
Answer: $12.80 for 2 kg ($0.64 per 100 g)
- First: $12.80 ÷ 20 = $0.64 per 100 g
- Second: $3.75 ÷ 5 = $0.75 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.