Matching Fractions, Decimals and Percentages
Age 7 to 14 Challenge Level:
Can you match pairs of fractions, decimals and percentages, and beat your previous scores?
Polygon Pictures
Age 11 to 14 Challenge Level:
Can you work out how these polygon pictures were drawn, and use that to figure out their angles?
An Equilateral Triangular Problem
Age 11 to 14 Challenge Level:
Take an equilateral triangle and cut it into smaller pieces. What can you do with them?
Terminating or Not
Age 11 to 14 Challenge Level:
Is there a quick way to work out whether a fraction terminates or recurs when you write it as a decimal?
Fractions and Percentages Card Game
Age 11 to 16 Challenge Level:
Can you find the pairs that represent the same amount of money?
Tiny Nines
Age 14 to 16 Challenge Level:
What do you notice about these families of recurring decimals?
Rod Fractions
Age 7 to 14 Challenge Level:
Pick two rods of different colours. Given an unlimited supply of rods of each of the two colours, how can we work out what fraction the shorter rod is of the longer one?
Colour Building
Age 11 to 14 Challenge Level:
Using only the red and white rods, how many different ways are there to make up the other rods?
Combining Lengths
Age 11 to 16 Challenge Level:
How many different lengths is it possible to measure with a set of three rods?
Searching for Mean(ing)
Age 11 to 16 Challenge Level:
If you have a large supply of 3kg and 8kg weights, how many of each would you need for the average (mean) of the weights to be 6kg?
NRICH is part of the family of activities in the Millennium Mathematics Project.