9th Grade Percentage Increase and Decrease Worksheet — Level 1 — Practice Set 4 — Answers
Answer sheet with worked solutions for the 9th Grade percentages worksheet.
Success TutoringWorksheetsAnswer sheet9th Grade · Mathematics · Percentages9th Grade 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 $380 to $285. Find the percentage decrease.
Answer: 25%
- Change = 380 − 285 = 95
- 95 ÷ 380 × 100 = 25%
2.A price changes from $140 to $70. Find the percentage decrease.
Answer: 50%
- Change = 140 − 70 = 70
- 70 ÷ 140 × 100 = 50%
3.A price changes from $380 to $304. Find the percentage decrease.
Answer: 20%
- Change = 380 − 304 = 76
- 76 ÷ 380 × 100 = 20%
4.A price changes from $260 to $312. Find the percentage increase.
Answer: 20%
- Change = 312 − 260 = 52
- 52 ÷ 260 × 100 = 20%
5.A price changes from $180 to $270. Find the percentage increase.
Answer: 50%
- Change = 270 − 180 = 90
- 90 ÷ 180 × 100 = 50%
6.A price changes from $200 to $100. Find the percentage decrease.
Answer: 50%
- Change = 200 − 100 = 100
- 100 ÷ 200 × 100 = 50%
7.A price changes from $60 to $90. Find the percentage increase.
Answer: 50%
- Change = 90 − 60 = 30
- 30 ÷ 60 × 100 = 50%
8.A price changes from $260 to $390. Find the percentage increase.
Answer: 50%
- Change = 390 − 260 = 130
- 130 ÷ 260 × 100 = 50%
9.A price changes from $360 to $540. Find the percentage increase.
Answer: 50%
- Change = 540 − 360 = 180
- 180 ÷ 360 × 100 = 50%
10.A price changes from $30 to $36. Find the percentage increase.
Answer: 20%
- Change = 36 − 30 = 6
- 6 ÷ 30 × 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.