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 $7.00 for 1 kg, or at $3.85 for 500 g?
Answer: $7.00 for 1 kg ($0.70 per 100 g)
- First: $7.00 ÷ 10 = $0.70 per 100 g
- Second: $3.85 ÷ 5 = $0.77 per 100 g
- The cheaper unit price is better value.
2.Which is better value: rice at $6.00 for 1 kg, or at $8.20 for 2 kg?
Answer: $8.20 for 2 kg ($0.41 per 100 g)
- First: $6.00 ÷ 10 = $0.60 per 100 g
- Second: $8.20 ÷ 20 = $0.41 per 100 g
- The cheaper unit price is better value.
3.Which is better value: juice at $2.70 for 1 L, or at $2.40 for 2 L?
Answer: $2.40 for 2 L ($0.12 per 100 mL)
- First: $2.70 ÷ 10 = $0.27 per 100 mL
- Second: $2.40 ÷ 20 = $0.12 per 100 mL
- The cheaper unit price is better value.
4.Which is better value: oats at $1.15 for 500 g, or at $6.80 for 2 kg?
Answer: $1.15 for 500 g ($0.23 per 100 g)
- First: $1.15 ÷ 5 = $0.23 per 100 g
- Second: $6.80 ÷ 20 = $0.34 per 100 g
- The cheaper unit price is better value.
5.Which is better value: pasta at $4.15 for 500 g, or at $1.95 for 250 g?
Answer: $1.95 for 250 g ($0.78 per 100 g)
- First: $4.15 ÷ 5 = $0.83 per 100 g
- Second: $1.95 ÷ 2.5 = $0.78 per 100 g
- The cheaper unit price is better value.
6.Which is better value: rice at $13.60 for 2 kg, or at $7.50 for 1 kg?
Answer: $13.60 for 2 kg ($0.68 per 100 g)
- First: $13.60 ÷ 20 = $0.68 per 100 g
- Second: $7.50 ÷ 10 = $0.75 per 100 g
- The cheaper unit price is better value.
7.Which is better value: pasta at $4.00 for 1 kg, or at $2.25 for 500 g?
Answer: $4.00 for 1 kg ($0.40 per 100 g)
- First: $4.00 ÷ 10 = $0.40 per 100 g
- Second: $2.25 ÷ 5 = $0.45 per 100 g
- The cheaper unit price is better value.
8.Which is better value: oats at $1.00 for 500 g, or at $6.00 for 2 kg?
Answer: $1.00 for 500 g ($0.20 per 100 g)
- First: $1.00 ÷ 5 = $0.20 per 100 g
- Second: $6.00 ÷ 20 = $0.30 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.