Year 9 Best Buys and Unit Prices Worksheet — Level 2 — Practice Set 3 — 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 3 — Answers
Find the price for the same amount of each (the unit price), then compare. Show your working.
1.Which is better value: oats at $2.65 for 500 g, or at $7.20 for 1 kg?
Answer: $2.65 for 500 g ($0.53 per 100 g)
- First: $2.65 ÷ 5 = $0.53 per 100 g
- Second: $7.20 ÷ 10 = $0.72 per 100 g
- The cheaper unit price is better value.
2.Which is better value: juice at $8.80 for 2 L, or at $0.90 for 250 mL?
Answer: $0.90 for 250 mL ($0.36 per 100 mL)
- First: $8.80 ÷ 20 = $0.44 per 100 mL
- Second: $0.90 ÷ 2.5 = $0.36 per 100 mL
- The cheaper unit price is better value.
3.Which is better value: juice at $1.35 for 250 mL, or at $9.00 for 2 L?
Answer: $9.00 for 2 L ($0.45 per 100 mL)
- First: $1.35 ÷ 2.5 = $0.54 per 100 mL
- Second: $9.00 ÷ 20 = $0.45 per 100 mL
- The cheaper unit price is better value.
4.Which is better value: pasta at $1.65 for 250 g, or at $7.70 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: $7.70 ÷ 10 = $0.77 per 100 g
- The cheaper unit price is better value.
5.Which is better value: juice at $1.00 for 250 mL, or at $3.40 for 1 L?
Answer: $3.40 for 1 L ($0.34 per 100 mL)
- First: $1.00 ÷ 2.5 = $0.40 per 100 mL
- Second: $3.40 ÷ 10 = $0.34 per 100 mL
- The cheaper unit price is better value.
6.Which is better value: juice at $6.50 for 1 L, or at $1.20 for 250 mL?
Answer: $1.20 for 250 mL ($0.48 per 100 mL)
- First: $6.50 ÷ 10 = $0.65 per 100 mL
- Second: $1.20 ÷ 2.5 = $0.48 per 100 mL
- The cheaper unit price is better value.
7.Which is better value: juice at $7.50 for 1 L, or at $16.80 for 2 L?
Answer: $7.50 for 1 L ($0.75 per 100 mL)
- First: $7.50 ÷ 10 = $0.75 per 100 mL
- Second: $16.80 ÷ 20 = $0.84 per 100 mL
- The cheaper unit price is better value.
8.Which is better value: rice at $1.80 for 1 kg, or at $1.40 for 500 g?
Answer: $1.80 for 1 kg ($0.18 per 100 g)
- First: $1.80 ÷ 10 = $0.18 per 100 g
- Second: $1.40 ÷ 5 = $0.28 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.