Year 8 Percentage Increase and Decrease Worksheet — Level 1 — Answers
Answer sheet with worked solutions for the Year 8 percentages worksheet.
Success TutoringWorksheetsAnswer sheetYear 8 · Mathematics · PercentagesYear 8 Percentage Increase and Decrease Worksheet — Level 1 — Answers
Percentage change = change ÷ original amount × 100. Always divide by the original amount.
1.A price changes from $300 to $450. Find the percentage increase.
Answer: 50%
- Change = 450 − 300 = 150
- 150 ÷ 300 × 100 = 50%
2.A price changes from $340 to $255. Find the percentage decrease.
Answer: 25%
- Change = 340 − 255 = 85
- 85 ÷ 340 × 100 = 25%
3.A price changes from $140 to $70. Find the percentage decrease.
Answer: 50%
- Change = 140 − 70 = 70
- 70 ÷ 140 × 100 = 50%
4.A price changes from $160 to $120. Find the percentage decrease.
Answer: 25%
- Change = 160 − 120 = 40
- 40 ÷ 160 × 100 = 25%
5.A price changes from $120 to $90. Find the percentage decrease.
Answer: 25%
- Change = 120 − 90 = 30
- 30 ÷ 120 × 100 = 25%
6.A price changes from $400 to $500. Find the percentage increase.
Answer: 25%
- Change = 500 − 400 = 100
- 100 ÷ 400 × 100 = 25%
7.A price changes from $150 to $75. Find the percentage decrease.
Answer: 50%
- Change = 150 − 75 = 75
- 75 ÷ 150 × 100 = 50%
8.A price changes from $20 to $10. Find the percentage decrease.
Answer: 50%
- Change = 20 − 10 = 10
- 10 ÷ 20 × 100 = 50%
9.A price changes from $40 to $36. Find the percentage decrease.
Answer: 10%
- Change = 40 − 36 = 4
- 4 ÷ 40 × 100 = 10%
10.A price changes from $370 to $333. Find the percentage decrease.
Answer: 10%
- Change = 370 − 333 = 37
- 37 ÷ 370 × 100 = 10%
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.