There are **21** NRICH Mathematical resources connected to **Percentages**, you may find related items under Fractions, Decimals, Percentages, Ratio and Proportion.

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A task involving the equivalence between fractions, percentages and decimals which depends on members of the group noticing the needs of others and responding.

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

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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?

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Can you find the pairs that represent the same amount of money?

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Can you match pairs of fractions, decimals and percentages, and beat your previous scores?

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Would you rather: Have 10% of Â£5 or 75% of 80p? Be given 60% of 2 pizzas or 26% of 5 pizzas?

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

In this article, Alf outlines six activities using the Gattegno chart, which help to develop understanding of place value, multiplication and division.

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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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Go through the maze, collecting and losing your money as you go. Which route gives you the highest return? And the lowest?

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Charlie thinks that a six comes up less often than the other numbers on the dice. Have a look at the results of the test his class did to see if he was right.

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

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

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Find the exact difference between the largest ball and the smallest ball on the Hepta Tree and then use this to work out the MAGIC NUMBER!

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Prove that the shaded area of the semicircle is equal to the area of the inner circle.

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Equal circles can be arranged so that each circle touches four or six others. What percentage of the plane is covered by circles in each packing pattern? ...

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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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In my local town there are three supermarkets which each has a special deal on some products. If you bought all your shopping in one shop, where would be the cheapest?