Year 11 Percentage Increase and Decrease Worksheet — Level 2 — Practice Set 3 — 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 2 — Practice Set 3 — Answers
Percentage change = change ÷ original amount × 100. Always divide by the original amount.
1.A price changes from $140 to $112. Find the percentage decrease.
Answer: 20%
- Change = 140 − 112 = 28
- 28 ÷ 140 × 100 = 20%
2.A price changes from $460 to $575. Find the percentage increase.
Answer: 25%
- Change = 575 − 460 = 115
- 115 ÷ 460 × 100 = 25%
3.A price changes from $800 to $1040. Find the percentage increase.
Answer: 30%
- Change = 1040 − 800 = 240
- 240 ÷ 800 × 100 = 30%
4.A price changes from $400 to $420. Find the percentage increase.
Answer: 5%
- Change = 420 − 400 = 20
- 20 ÷ 400 × 100 = 5%
5.A price changes from $580 to $725. Find the percentage increase.
Answer: 25%
- Change = 725 − 580 = 145
- 145 ÷ 580 × 100 = 25%
6.A price changes from $200 to $120. Find the percentage decrease.
Answer: 40%
- Change = 200 − 120 = 80
- 80 ÷ 200 × 100 = 40%
7.A price changes from $240 to $204. Find the percentage decrease.
Answer: 15%
- Change = 240 − 204 = 36
- 36 ÷ 240 × 100 = 15%
8.A price changes from $580 to $406. Find the percentage decrease.
Answer: 30%
- Change = 580 − 406 = 174
- 174 ÷ 580 × 100 = 30%
9.A price changes from $540 to $324. Find the percentage decrease.
Answer: 40%
- Change = 540 − 324 = 216
- 216 ÷ 540 × 100 = 40%
10.A price changes from $660 to $1155. Find the percentage increase.
Answer: 75%
- Change = 1155 − 660 = 495
- 495 ÷ 660 × 100 = 75%
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.