Year 8 Best Buys and Unit Prices Worksheet — Level 2 — Practice Set 3 — 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 3 — 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 $0.60 for 250 mL, or at $0.80 for 1 L?
Answer: $0.80 for 1 L ($0.08 per 100 mL)
- First: $0.60 ÷ 2.5 = $0.24 per 100 mL
- Second: $0.80 ÷ 10 = $0.08 per 100 mL
- The cheaper unit price is better value.
2.Which is better value: rice at $3.70 for 1 kg, or at $11.00 for 2 kg?
Answer: $3.70 for 1 kg ($0.37 per 100 g)
- First: $3.70 ÷ 10 = $0.37 per 100 g
- Second: $11.00 ÷ 20 = $0.55 per 100 g
- The cheaper unit price is better value.
3.Which is better value: rice at $4.50 for 1 kg, or at $2.00 for 500 g?
Answer: $2.00 for 500 g ($0.40 per 100 g)
- First: $4.50 ÷ 10 = $0.45 per 100 g
- Second: $2.00 ÷ 5 = $0.40 per 100 g
- The cheaper unit price is better value.
4.Which is better value: juice at $8.40 for 2 L, or at $3.30 for 1 L?
Answer: $3.30 for 1 L ($0.33 per 100 mL)
- First: $8.40 ÷ 20 = $0.42 per 100 mL
- Second: $3.30 ÷ 10 = $0.33 per 100 mL
- The cheaper unit price is better value.
5.Which is better value: pencils at $3.18 for a pack of 6, or at $5.40 for a pack of 12?
Answer: $5.40 for a pack of 12 ($0.45 per pencil)
- First: $3.18 ÷ 6 = $0.53 per pencil
- Second: $5.40 ÷ 12 = $0.45 per pencil
- The cheaper unit price is better value.
6.Which is better value: pencils at $8.88 for a pack of 24, or at $6.72 for a pack of 12?
Answer: $8.88 for a pack of 24 ($0.37 per pencil)
- First: $8.88 ÷ 24 = $0.37 per pencil
- Second: $6.72 ÷ 12 = $0.56 per pencil
- The cheaper unit price is better value.
7.Which is better value: rice at $4.80 for 2 kg, or at $1.75 for 500 g?
Answer: $4.80 for 2 kg ($0.24 per 100 g)
- First: $4.80 ÷ 20 = $0.24 per 100 g
- Second: $1.75 ÷ 5 = $0.35 per 100 g
- The cheaper unit price is better value.
8.Which is better value: pencils at $3.84 for a pack of 6, or at $17.04 for a pack of 24?
Answer: $3.84 for a pack of 6 ($0.64 per pencil)
- First: $3.84 ÷ 6 = $0.64 per pencil
- Second: $17.04 ÷ 24 = $0.71 per pencil
- 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.