Grade 8 Percent Change Worksheets

Start with eight focused practice problems, then use the answer key below to check the worksheet.

Practice Worksheet

Grade 8 Percent Change Practice

Solve each problem. Show your work.

1.
Increase 145 by 50%.
2.
Increase 165 by 50%.
3.
Decrease 40 by 50%.
4.
Decrease 75 by 15%.
5.
Increase 40 by 5%.
6.
Increase 145 by 25%.
7.
Increase 85 by 10%.
8.
Decrease 90 by 10%.

Show answer key

Question 1: 217.5
Question 2: 247.5
Question 3: 20
Question 4: 63.8
Question 5: 42
Question 6: 181.3
Question 7: 93.5
Question 8: 81

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About These Worksheets

Grade 8 students apply percent change in multi-step proportional reasoning, data interpretation, and algebra-readiness problems.

Percent change worksheets focus on increase and decrease problems, one of the most practical uses of percent in middle school. Students learn to compare the amount of change to the original value, not the new value, which is the detail that makes percent change different from a simple subtraction problem. That distinction matters in discounts, markups, population changes, test scores, and sports statistics.

These worksheets include both direct questions, such as finding the percent increase from 40 to 50, and applied contexts, such as a price rising after tax or falling during a sale. Students practise using the formula change divided by original, then multiplying by 100, while also learning quick mental checks. If a price doubles, the increase is 100%; if it is cut in half, the decrease is 50%. These anchors help students spot unreasonable answers before they become habits.

Skills Practised

Finding the amount of increase or decrease
Dividing the change by the original value
Calculating percent increase and percent decrease
Solving sale, markup, growth, and decline problems
Using benchmark changes to check answers

Parent Tip: Ask your child to label the original value before calculating. Percent change uses the original as the denominator, and mixing it up with the new value is the most common mistake.