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Resources tagged with Calculating with percentages similar to Weekly Problem 7 - 2009:

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Challenge level: Challenge Level:1 Challenge Level:2 Challenge Level:3

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Broad Topics > Fractions, Decimals, Percentages, Ratio and Proportion > Calculating with percentages

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Mathland Election

Stage: 3 Challenge Level: Challenge Level:1

A political commentator summed up an election result. Given that there were just four candidates and that the figures quoted were exact find the number of votes polled for each candidate.

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CD Heaven

Stage: 4 Challenge Level: Challenge Level:2 Challenge Level:2

All CD Heaven stores were given the same number of a popular CD to sell for £24. In their two week sale each store reduces the price of the CD by 25% ... How many CDs did the store sell at. . . .

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The Legacy

Stage: 4 Challenge Level: Challenge Level:2 Challenge Level:2

Your school has been left a million pounds in the will of an ex- pupil. What model of investment and spending would you use in order to ensure the best return on the money?

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Put Out the Flags

Stage: 3 Challenge Level: Challenge Level:1

Tim and Beth both have a string of flags. Use the percentages to find out who has the most flags.

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Roasting Old Chestnuts 4

Stage: 3 and 4

For teachers. Yet more school maths from long ago-interest and percentages.

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Dating Made Easier

Stage: 4 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

If a sum invested gains 10% each year how long before it has doubled its value?

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KS3 Percentages

Stage: 3 Challenge Level: Challenge Level:1

This package is designed around work on percentages which is outlined in the KS3 Mathematics Framework. One NRICH game and one problem have been identified to support the work on percentages in each. . . .

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One or Both

Stage: 3 Challenge Level: Challenge Level:2 Challenge Level:2

Problem one was solved by 70% of the pupils. Problem 2 was solved by 60% of them. Every pupil solved at least one of the problems. Nine pupils solved both problems. How many pupils took the exam?

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Retiring to Paradise

Stage: 3 Challenge Level: Challenge Level:1

When Charlie retires, he's looking forward to the quiet life, whereas Alison wants a busy and exciting retirement. Can you advise them on where they should go?

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Percentage Unchanged

Stage: 4 Challenge Level: Challenge Level:2 Challenge Level:2

If the base of a rectangle is increased by 10% and the area is unchanged, by what percentage (exactly) is the width decreased by ?

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A Change in Code

Stage: 4 Challenge Level: Challenge Level:1

There are two sets of numbers. The second is the result of the first after an increase by a constant percentage. How can you find that percentage if one set of numbers is in code?