Year 9 Percentage Increase and Decrease Worksheet — Level 1 — Answers
Answer sheet with worked solutions for the Year 9 percentages worksheet.
Success TutoringWorksheetsAnswer sheetYear 9 · Mathematics · PercentagesYear 9 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 $160 to $120. Find the percentage decrease.
Answer: 25%
- Change = 160 − 120 = 40
- 40 ÷ 160 × 100 = 25%
2.A price changes from $160 to $200. Find the percentage increase.
Answer: 25%
- Change = 200 − 160 = 40
- 40 ÷ 160 × 100 = 25%
3.A price changes from $340 to $408. Find the percentage increase.
Answer: 20%
- Change = 408 − 340 = 68
- 68 ÷ 340 × 100 = 20%
4.A price changes from $120 to $180. Find the percentage increase.
Answer: 50%
- Change = 180 − 120 = 60
- 60 ÷ 120 × 100 = 50%
5.A price changes from $120 to $132. Find the percentage increase.
Answer: 10%
- Change = 132 − 120 = 12
- 12 ÷ 120 × 100 = 10%
6.A price changes from $50 to $45. Find the percentage decrease.
Answer: 10%
- Change = 50 − 45 = 5
- 5 ÷ 50 × 100 = 10%
7.A price changes from $100 to $110. Find the percentage increase.
Answer: 10%
- Change = 110 − 100 = 10
- 10 ÷ 100 × 100 = 10%
8.A price changes from $300 to $360. Find the percentage increase.
Answer: 20%
- Change = 360 − 300 = 60
- 60 ÷ 300 × 100 = 20%
9.A price changes from $180 to $144. Find the percentage decrease.
Answer: 20%
- Change = 180 − 144 = 36
- 36 ÷ 180 × 100 = 20%
10.A price changes from $40 to $44. Find the percentage increase.
Answer: 10%
- Change = 44 − 40 = 4
- 4 ÷ 40 × 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.