Percentage Change

Practise calculating percentage increase and percentage decrease in this set of exercises.

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This is level 5: find the original amount after a percentage increase or decrease given the final value. You can earn a trophy if you get at least 7 questions correct. You can use a calculator.

 1. Find the original amount if after an increase of 70% it becomes 102. 2. Find the original amount if after a decrease of 55% it becomes 54. 3. Find the original amount if after an increase of 90% it becomes 228. 4. Find the original amount if after a decrease of 85% it becomes 3. 5. Find the original amount if after an increase of 16% it becomes 696. 6. Find the original amount if after a decrease of 2% it becomes 686. 7. After an increase of 28% the number of items in a count was found to be 320. What was the original number of items. 8. The number of plants remaining in a park after a harsh winter was 1539. This was calculated to be 91% fewer than the original number of plants. Find the original number. 9. The number of cars passing a certain junction was counted to be 6364. This was a decrease of 26% compared to the previous week. Find the number of cars passing the junction in the previous week. 10. After an increase of 82% the number of items in a count was found to be 164346. What was the original number of items.
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This is Percentage Change level 5. You can also try:
Level 1 Level 2 Level 3 Level 4 Level 6 Level 7

Instructions

Try your best to answer the questions above. Type your answers into the boxes provided leaving no spaces. As you work through the exercise regularly click the "check" button. If you have any wrong answers, do your best to do corrections but if there is anything you don't understand, please ask your teacher for help.

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Description of Levels

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Simple Percentages - A good place to start.

Level 1 - Find the new amount after a percentage increase.

Level 2 - Find the new amount after a percentage decrease.

Level 3 - Find the percentage increase given the original and final values.

Level 4 - Find the percentage decrease given the original and final values.

Level 5 - Find the original amount after a percentage increase or decrease given the final value.

Level 6 - Mixed questions.

Level 7 - Challenging questions.

Switch - Practise percentage increase and decrease calculations by completing this table.

Exam Style questions are in the style of GCSE or IB/A-level exam paper questions and worked solutions are available for Transum subscribers.

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Curriculum Reference

See the National Curriculum page for links to related online activities and resources.

Example

You may want to use a calculator for some of the questions. See Calculator Workout skill 3.

Don't wait until you have finished the exercise before you click on the 'Check' button. Click it often as you work through the questions to see if you are answering them correctly.

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