Year 11 Percentage Increase and Decrease Worksheet — Level 1 — Answers
Answer sheet with worked solutions for the Year 11 percentages worksheet.
Success TutoringWorksheetsAnswer sheetYear 11 · Mathematics · PercentagesYear 11 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 $270 to $243. Find the percentage decrease.
Answer: 10%
- Change = 270 − 243 = 27
- 27 ÷ 270 × 100 = 10%
2.A price changes from $130 to $156. Find the percentage increase.
Answer: 20%
- Change = 156 − 130 = 26
- 26 ÷ 130 × 100 = 20%
3.A price changes from $260 to $130. Find the percentage decrease.
Answer: 50%
- Change = 260 − 130 = 130
- 130 ÷ 260 × 100 = 50%
4.A price changes from $330 to $165. Find the percentage decrease.
Answer: 50%
- Change = 330 − 165 = 165
- 165 ÷ 330 × 100 = 50%
5.A price changes from $100 to $150. Find the percentage increase.
Answer: 50%
- Change = 150 − 100 = 50
- 50 ÷ 100 × 100 = 50%
6.A price changes from $280 to $336. Find the percentage increase.
Answer: 20%
- Change = 336 − 280 = 56
- 56 ÷ 280 × 100 = 20%
7.A price changes from $390 to $585. Find the percentage increase.
Answer: 50%
- Change = 585 − 390 = 195
- 195 ÷ 390 × 100 = 50%
8.A price changes from $170 to $85. Find the percentage decrease.
Answer: 50%
- Change = 170 − 85 = 85
- 85 ÷ 170 × 100 = 50%
9.A price changes from $210 to $189. Find the percentage decrease.
Answer: 10%
- Change = 210 − 189 = 21
- 21 ÷ 210 × 100 = 10%
10.A price changes from $160 to $80. Find the percentage decrease.
Answer: 50%
- Change = 160 − 80 = 80
- 80 ÷ 160 × 100 = 50%
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.