Year 10 Percentage Increase and Decrease Worksheet — Level 1 — Practice Set 4 — Answers
Answer sheet with worked solutions for the Year 10 percentages worksheet.
Success TutoringWorksheetsAnswer sheetYear 10 · Mathematics · PercentagesYear 10 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 $370 to $333. Find the percentage decrease.
Answer: 10%
- Change = 370 − 333 = 37
- 37 ÷ 370 × 100 = 10%
2.A price changes from $250 to $275. Find the percentage increase.
Answer: 10%
- Change = 275 − 250 = 25
- 25 ÷ 250 × 100 = 10%
3.A price changes from $250 to $225. Find the percentage decrease.
Answer: 10%
- Change = 250 − 225 = 25
- 25 ÷ 250 × 100 = 10%
4.A price changes from $90 to $135. Find the percentage increase.
Answer: 50%
- Change = 135 − 90 = 45
- 45 ÷ 90 × 100 = 50%
5.A price changes from $260 to $312. Find the percentage increase.
Answer: 20%
- Change = 312 − 260 = 52
- 52 ÷ 260 × 100 = 20%
6.A price changes from $370 to $555. Find the percentage increase.
Answer: 50%
- Change = 555 − 370 = 185
- 185 ÷ 370 × 100 = 50%
7.A price changes from $100 to $50. Find the percentage decrease.
Answer: 50%
- Change = 100 − 50 = 50
- 50 ÷ 100 × 100 = 50%
8.A price changes from $80 to $72. Find the percentage decrease.
Answer: 10%
- Change = 80 − 72 = 8
- 8 ÷ 80 × 100 = 10%
9.A price changes from $30 to $27. Find the percentage decrease.
Answer: 10%
- Change = 30 − 27 = 3
- 3 ÷ 30 × 100 = 10%
10.A price changes from $110 to $132. Find the percentage increase.
Answer: 20%
- Change = 132 − 110 = 22
- 22 ÷ 110 × 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.