Year 8 Best Buys and Unit Prices Worksheet — Level 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 — 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 $4.10 for 500 g, or at $18.40 for 2 kg?
Answer: $4.10 for 500 g ($0.82 per 100 g)
- First: $4.10 ÷ 5 = $0.82 per 100 g
- Second: $18.40 ÷ 20 = $0.92 per 100 g
- The cheaper unit price is better value.
2.Which is better value: pencils at $6.72 for a pack of 24, or at $1.80 for a pack of 12?
Answer: $1.80 for a pack of 12 ($0.15 per pencil)
- First: $6.72 ÷ 24 = $0.28 per pencil
- Second: $1.80 ÷ 12 = $0.15 per pencil
- The cheaper unit price is better value.
3.Which is better value: pencils at $0.90 for a pack of 6, or at $6.00 for a pack of 24?
Answer: $0.90 for a pack of 6 ($0.15 per pencil)
- First: $0.90 ÷ 6 = $0.15 per pencil
- Second: $6.00 ÷ 24 = $0.25 per pencil
- The cheaper unit price is better value.
4.Which is better value: juice at $0.80 for 250 mL, or at $9.40 for 2 L?
Answer: $0.80 for 250 mL ($0.32 per 100 mL)
- First: $0.80 ÷ 2.5 = $0.32 per 100 mL
- Second: $9.40 ÷ 20 = $0.47 per 100 mL
- The cheaper unit price is better value.
5.Which is better value: oats at $16.60 for 2 kg, or at $9.50 for 1 kg?
Answer: $16.60 for 2 kg ($0.83 per 100 g)
- First: $16.60 ÷ 20 = $0.83 per 100 g
- Second: $9.50 ÷ 10 = $0.95 per 100 g
- The cheaper unit price is better value.
6.Which is better value: pasta at $2.50 for 500 g, or at $6.30 for 1 kg?
Answer: $2.50 for 500 g ($0.50 per 100 g)
- First: $2.50 ÷ 5 = $0.50 per 100 g
- Second: $6.30 ÷ 10 = $0.63 per 100 g
- The cheaper unit price is better value.
7.Which is better value: rice at $3.20 for 500 g, or at $7.40 for 1 kg?
Answer: $3.20 for 500 g ($0.64 per 100 g)
- First: $3.20 ÷ 5 = $0.64 per 100 g
- Second: $7.40 ÷ 10 = $0.74 per 100 g
- The cheaper unit price is better value.
8.Which is better value: rice at $4.70 for 1 kg, or at $2.70 for 500 g?
Answer: $4.70 for 1 kg ($0.47 per 100 g)
- First: $4.70 ÷ 10 = $0.47 per 100 g
- Second: $2.70 ÷ 5 = $0.54 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.