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7th Grade Percentage Increase and Decrease Worksheet — Level 3 — Practice Set 2 — Answers

Answer sheet with worked solutions for the 7th Grade percentages worksheet.

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Success TutoringWorksheetsAnswer sheet7th Grade · Mathematics · Percentages

7th Grade Percentage Increase and Decrease Worksheet — Level 3 — Practice Set 2 — Answers

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

1.After a 10% increase, a price is $528. What was the original price?

Answer: $480

  1. New price = 110% of the original
  2. Original = 528 ÷ 1.1
  3. = $480
2.After a 25% increase, a price is $750. What was the original price?

Answer: $600

  1. New price = 125% of the original
  2. Original = 750 ÷ 1.25
  3. = $600
3.A price changes from $800 to $200. Find the percentage decrease.

Answer: 75%

  1. Change = 800 − 200 = 600
  2. 600 ÷ 800 × 100 = 75%
4.A price changes from $560 to $980. Find the percentage increase.

Answer: 75%

  1. Change = 980 − 560 = 420
  2. 420 ÷ 560 × 100 = 75%
5.After a 10% increase, a price is $374. What was the original price?

Answer: $340

  1. New price = 110% of the original
  2. Original = 374 ÷ 1.1
  3. = $340
6.After a 15% increase, a price is $115. What was the original price?

Answer: $100

  1. New price = 115% of the original
  2. Original = 115 ÷ 1.15
  3. = $100
7.After a 25% decrease, a price is $405. What was the original price?

Answer: $540

  1. New price = 75% of the original
  2. Original = 405 ÷ 0.75
  3. = $540
8.After a 75% decrease, a price is $180. What was the original price?

Answer: $720

  1. New price = 25% of the original
  2. Original = 180 ÷ 0.25
  3. = $720
9.A price changes from $300 to $345. Find the percentage increase.

Answer: 15%

  1. Change = 345 − 300 = 45
  2. 45 ÷ 300 × 100 = 15%
10.A price changes from $280 to $238. Find the percentage decrease.

Answer: 15%

  1. Change = 280 − 238 = 42
  2. 42 ÷ 280 × 100 = 15%
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