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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 ?
Circle Packing
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? ...
Round and Round
Prove that the shaded area of the semicircle is equal to the area of the inner circle.
Age 11 to 16
Challenge Level
The aim of this game is to match pairs of cards.
Click on a card in the interactivity below to select it. Then click on another one. If the two cards match, they will change colour. If the two cards do not match, select another pair.
The game ends when all the cards have been matched in pairs.
Click on the links below if you would like to try some alternative versions of the game
You can play the game away from the computer by printing these Fractions and Percentages cards
If you print double-sided, the cards will each have an NRICH logo on the back. If you would prefer them to be blank on the back, just print the first page.
We would love to hear about the strategies you used to work out which pairs matched.
NRICH is part of the family of activities in the Millennium Mathematics Project.