If the base of a rectangle is increased by 10% and the area is
unchanged, by what percentage (exactly) is the width decreased by ?
Prove that the shaded area of the semicircle is equal to the area of the inner circle.
Match the cards of the same value.
Can you match the cards and figure out whether the tabloid headlines can be trusted?
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? ...
A group of interactive resources to support work on percentages Key
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?
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. . . .
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.
An activity based on the game 'Pelmanism'. Set your own level of challenge and beat your own previous best score.