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Percentage Unchanged

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

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CD Heaven

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 each price?

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Trusting the Tabloids

Can you match the cards and figure out whether the tabloid headlines can be trusted?

Dating Made Easier

Age 14 to 16 Challenge Level:

This problem was designed to explore equivalence of change (ie. if a $10\%$ decrease isn't the opposite of a $10\%$ increase, what is? ) and to move students towards the important Stage 5 concept: exponential growth and decay.