Year 8 Best Buys and Unit Prices Worksheet — Level 2 — Practice Set 2 — Answers
Answer sheet with worked solutions for the Year 8 ratio & rates worksheet.
Success TutoringWorksheetsAnswer sheetYear 8 · Mathematics · Ratio & RatesYear 8 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 $15.80 for 2 kg, or at $9.30 for 1 kg?
Answer: $15.80 for 2 kg ($0.79 per 100 g)
- First: $15.80 ÷ 20 = $0.79 per 100 g
- Second: $9.30 ÷ 10 = $0.93 per 100 g
- The cheaper unit price is better value.
2.Which is better value: juice at $17.80 for 2 L, or at $7.90 for 1 L?
Answer: $7.90 for 1 L ($0.79 per 100 mL)
- First: $17.80 ÷ 20 = $0.89 per 100 mL
- Second: $7.90 ÷ 10 = $0.79 per 100 mL
- The cheaper unit price is better value.
3.Which is better value: pencils at $20.40 for a pack of 24, or at $4.14 for a pack of 6?
Answer: $4.14 for a pack of 6 ($0.69 per pencil)
- First: $20.40 ÷ 24 = $0.85 per pencil
- Second: $4.14 ÷ 6 = $0.69 per pencil
- The cheaper unit price is better value.
4.Which is better value: rice at $8.80 for 2 kg, or at $1.85 for 500 g?
Answer: $1.85 for 500 g ($0.37 per 100 g)
- First: $8.80 ÷ 20 = $0.44 per 100 g
- Second: $1.85 ÷ 5 = $0.37 per 100 g
- The cheaper unit price is better value.
5.Which is better value: pencils at $1.38 for a pack of 6, or at $7.68 for a pack of 24?
Answer: $1.38 for a pack of 6 ($0.23 per pencil)
- First: $1.38 ÷ 6 = $0.23 per pencil
- Second: $7.68 ÷ 24 = $0.32 per pencil
- The cheaper unit price is better value.
6.Which is better value: pasta at $4.10 for 500 g, or at $1.75 for 250 g?
Answer: $1.75 for 250 g ($0.70 per 100 g)
- First: $4.10 ÷ 5 = $0.82 per 100 g
- Second: $1.75 ÷ 2.5 = $0.70 per 100 g
- The cheaper unit price is better value.
7.Which is better value: pencils at $3.30 for a pack of 6, or at $14.64 for a pack of 24?
Answer: $3.30 for a pack of 6 ($0.55 per pencil)
- First: $3.30 ÷ 6 = $0.55 per pencil
- Second: $14.64 ÷ 24 = $0.61 per pencil
- The cheaper unit price is better value.
8.Which is better value: pasta at $7.50 for 1 kg, or at $3.50 for 500 g?
Answer: $3.50 for 500 g ($0.70 per 100 g)
- First: $7.50 ÷ 10 = $0.75 per 100 g
- Second: $3.50 ÷ 5 = $0.70 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.