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8th Grade Percentage Increase and Decrease Worksheet — Level 3 — Practice Set 3 — Answers

Answer sheet with worked solutions for the 8th Grade percentages worksheet.

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Success TutoringWorksheetsAnswer sheet8th Grade · Mathematics · Percentages

8th Grade Percentage Increase and Decrease Worksheet — Level 3 — Practice Set 3 — Answers

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

1.A price changes from $220 to $308. Find the percentage increase.

Answer: 40%

  1. Change = 308 − 220 = 88
  2. 88 ÷ 220 × 100 = 40%
2.A price changes from $440 to $352. Find the percentage decrease.

Answer: 20%

  1. Change = 440 − 352 = 88
  2. 88 ÷ 440 × 100 = 20%
3.After a 30% decrease, a price is $350. What was the original price?

Answer: $500

  1. New price = 70% of the original
  2. Original = 350 ÷ 0.7
  3. = $500
4.After a 30% increase, a price is $572. What was the original price?

Answer: $440

  1. New price = 130% of the original
  2. Original = 572 ÷ 1.3
  3. = $440
5.After a 25% increase, a price is $550. What was the original price?

Answer: $440

  1. New price = 125% of the original
  2. Original = 550 ÷ 1.25
  3. = $440
6.After a 10% increase, a price is $726. What was the original price?

Answer: $660

  1. New price = 110% of the original
  2. Original = 726 ÷ 1.1
  3. = $660
7.After a 40% increase, a price is $644. What was the original price?

Answer: $460

  1. New price = 140% of the original
  2. Original = 644 ÷ 1.4
  3. = $460
8.After a 40% decrease, a price is $420. What was the original price?

Answer: $700

  1. New price = 60% of the original
  2. Original = 420 ÷ 0.6
  3. = $700
9.A price changes from $620 to $248. Find the percentage decrease.

Answer: 60%

  1. Change = 620 − 248 = 372
  2. 372 ÷ 620 × 100 = 60%
10.After a 25% increase, a price is $325. What was the original price?

Answer: $260

  1. New price = 125% of the original
  2. Original = 325 ÷ 1.25
  3. = $260
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