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 $260 to $195. Find the percentage decrease.
Answer: 25%
- Change = 260 − 195 = 65
- 65 ÷ 260 × 100 = 25%
2.A price changes from $360 to $180. Find the percentage decrease.
Answer: 50%
- Change = 360 − 180 = 180
- 180 ÷ 360 × 100 = 50%
3.A price changes from $330 to $363. Find the percentage increase.
Answer: 10%
- Change = 363 − 330 = 33
- 33 ÷ 330 × 100 = 10%
4.A price changes from $30 to $24. Find the percentage decrease.
Answer: 20%
- Change = 30 − 24 = 6
- 6 ÷ 30 × 100 = 20%
5.A price changes from $190 to $209. Find the percentage increase.
Answer: 10%
- Change = 209 − 190 = 19
- 19 ÷ 190 × 100 = 10%
6.A price changes from $190 to $228. Find the percentage increase.
Answer: 20%
- Change = 228 − 190 = 38
- 38 ÷ 190 × 100 = 20%
7.A price changes from $180 to $90. Find the percentage decrease.
Answer: 50%
- Change = 180 − 90 = 90
- 90 ÷ 180 × 100 = 50%
8.A price changes from $210 to $231. Find the percentage increase.
Answer: 10%
- Change = 231 − 210 = 21
- 21 ÷ 210 × 100 = 10%
9.A price changes from $400 to $440. Find the percentage increase.
Answer: 10%
- Change = 440 − 400 = 40
- 40 ÷ 400 × 100 = 10%
10.A price changes from $240 to $288. Find the percentage increase.
Answer: 20%
- Change = 288 − 240 = 48
- 48 ÷ 240 × 100 = 20%
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.