Year 11 Percentage Increase and Decrease Worksheet — Level 1 — Practice Set 4 — 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 — Practice Set 4 — Answers
Percentage change = change ÷ original amount × 100. Always divide by the original amount.
1.A price changes from $340 to $272. Find the percentage decrease.
Answer: 20%
- Change = 340 − 272 = 68
- 68 ÷ 340 × 100 = 20%
2.A price changes from $90 to $72. Find the percentage decrease.
Answer: 20%
- Change = 90 − 72 = 18
- 18 ÷ 90 × 100 = 20%
3.A price changes from $80 to $96. Find the percentage increase.
Answer: 20%
- Change = 96 − 80 = 16
- 16 ÷ 80 × 100 = 20%
4.A price changes from $240 to $360. Find the percentage increase.
Answer: 50%
- Change = 360 − 240 = 120
- 120 ÷ 240 × 100 = 50%
5.A price changes from $160 to $120. Find the percentage decrease.
Answer: 25%
- Change = 160 − 120 = 40
- 40 ÷ 160 × 100 = 25%
6.A price changes from $100 to $110. Find the percentage increase.
Answer: 10%
- Change = 110 − 100 = 10
- 10 ÷ 100 × 100 = 10%
7.A price changes from $360 to $540. Find the percentage increase.
Answer: 50%
- Change = 540 − 360 = 180
- 180 ÷ 360 × 100 = 50%
8.A price changes from $390 to $585. Find the percentage increase.
Answer: 50%
- Change = 585 − 390 = 195
- 195 ÷ 390 × 100 = 50%
9.A price changes from $330 to $495. Find the percentage increase.
Answer: 50%
- Change = 495 − 330 = 165
- 165 ÷ 330 × 100 = 50%
10.A price changes from $370 to $555. Find the percentage increase.
Answer: 50%
- Change = 555 − 370 = 185
- 185 ÷ 370 × 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.