Year 7 Best Buys and Unit Prices Worksheet — Level 2 — Practice Set 2 — Answers
Answer sheet with worked solutions for the Year 7 ratio & rates worksheet.
Success TutoringWorksheetsAnswer sheetYear 7 · Mathematics · Ratio & RatesYear 7 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: oats at $5.50 for 1 kg, or at $7.20 for 2 kg?
Answer: $7.20 for 2 kg ($0.36 per 100 g)
- First: $5.50 ÷ 10 = $0.55 per 100 g
- Second: $7.20 ÷ 20 = $0.36 per 100 g
- The cheaper unit price is better value.
2.Which is better value: rice at $1.80 for 500 g, or at $4.10 for 1 kg?
Answer: $1.80 for 500 g ($0.36 per 100 g)
- First: $1.80 ÷ 5 = $0.36 per 100 g
- Second: $4.10 ÷ 10 = $0.41 per 100 g
- The cheaper unit price is better value.
3.Which is better value: juice at $9.00 for 2 L, or at $1.40 for 250 mL?
Answer: $9.00 for 2 L ($0.45 per 100 mL)
- First: $9.00 ÷ 20 = $0.45 per 100 mL
- Second: $1.40 ÷ 2.5 = $0.56 per 100 mL
- The cheaper unit price is better value.
4.Which is better value: pencils at $7.80 for a pack of 12, or at $3.48 for a pack of 6?
Answer: $3.48 for a pack of 6 ($0.58 per pencil)
- First: $7.80 ÷ 12 = $0.65 per pencil
- Second: $3.48 ÷ 6 = $0.58 per pencil
- The cheaper unit price is better value.
5.Which is better value: pencils at $9.48 for a pack of 12, or at $5.52 for a pack of 6?
Answer: $9.48 for a pack of 12 ($0.79 per pencil)
- First: $9.48 ÷ 12 = $0.79 per pencil
- Second: $5.52 ÷ 6 = $0.92 per pencil
- The cheaper unit price is better value.
6.Which is better value: oats at $4.40 for 1 kg, or at $7.00 for 2 kg?
Answer: $7.00 for 2 kg ($0.35 per 100 g)
- First: $4.40 ÷ 10 = $0.44 per 100 g
- Second: $7.00 ÷ 20 = $0.35 per 100 g
- The cheaper unit price is better value.
7.Which is better value: pasta at $3.80 for 500 g, or at $9.50 for 1 kg?
Answer: $3.80 for 500 g ($0.76 per 100 g)
- First: $3.80 ÷ 5 = $0.76 per 100 g
- Second: $9.50 ÷ 10 = $0.95 per 100 g
- The cheaper unit price is better value.
8.Which is better value: pasta at $0.85 for 250 g, or at $1.40 for 500 g?
Answer: $1.40 for 500 g ($0.28 per 100 g)
- First: $0.85 ÷ 2.5 = $0.34 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.