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Class 8 Percentage Increase and Decrease — practice questions with answers

Comparing Quantities · 5 sample questions from the school syllabus. Try each one, then open the answer and the worked solution.

1. A number is increased from 200 to 250. What is the percentage increase?
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Answer: A) 25%
Increase = 250 - 200 = 50. Percentage increase = x 100 = 25%.
2. A shaded bar shows a quantity that grew from 4 units to 5 units. What is the percentage increase?
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Answer: A) 25%
Increase = 1 unit. Percentage = x 100 = 25%.
3. If a number is increased by 100% it becomes 70. The original number was:
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Answer: D) 35
Original x 2 = 70, so original = 35.
4. The side of a square garden in a Delhi colony is increased by 10%.
By what percentage does its area increase?
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Answer: A) 21%
Area factor = 1.10 x 1.10 = 1.21, a 21% increase.
5. The population of a city increased by 10% in the first year and decreased by 10% in the second year, ending at 99000.
What was the population at the start of the first year?
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Answer: A) 100000
Factor = 1.10 x 0.90 = 0.99. Original x 0.99 = 99000, so original = = 100000.
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