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9th Grade Percentage Increase and Decrease Worksheet — Level 3 — Practice Set 4 — Answers

Answer sheet with worked solutions for the 9th Grade percentages worksheet.

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Success TutoringWorksheetsAnswer sheet9th Grade · Mathematics · Percentages

9th Grade Percentage Increase and Decrease Worksheet — Level 3 — Practice Set 4 — Answers

Percentage change = change ÷ original amount × 100. Always divide by the original amount.

1.A price changes from $80 to $112. Find the percentage increase.

Answer: 40%

  1. Change = 112 − 80 = 32
  2. 32 ÷ 80 × 100 = 40%
2.A price changes from $420 to $441. Find the percentage increase.

Answer: 5%

  1. Change = 441 − 420 = 21
  2. 21 ÷ 420 × 100 = 5%
3.A price changes from $260 to $416. Find the percentage increase.

Answer: 60%

  1. Change = 416 − 260 = 156
  2. 156 ÷ 260 × 100 = 60%
4.After a 60% increase, a price is $800. What was the original price?

Answer: $500

  1. New price = 160% of the original
  2. Original = 800 ÷ 1.6
  3. = $500
5.After a 40% increase, a price is $1008. What was the original price?

Answer: $720

  1. New price = 140% of the original
  2. Original = 1008 ÷ 1.4
  3. = $720
6.After a 5% decrease, a price is $133. What was the original price?

Answer: $140

  1. New price = 95% of the original
  2. Original = 133 ÷ 0.95
  3. = $140
7.A price changes from $100 to $25. Find the percentage decrease.

Answer: 75%

  1. Change = 100 − 25 = 75
  2. 75 ÷ 100 × 100 = 75%
8.After a 75% increase, a price is $1120. What was the original price?

Answer: $640

  1. New price = 175% of the original
  2. Original = 1120 ÷ 1.75
  3. = $640
9.After a 15% increase, a price is $506. What was the original price?

Answer: $440

  1. New price = 115% of the original
  2. Original = 506 ÷ 1.15
  3. = $440
10.A price changes from $740 to $888. Find the percentage increase.

Answer: 20%

  1. Change = 888 − 740 = 148
  2. 148 ÷ 740 × 100 = 20%
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