Missing Multipliers
Age 7 to 14 Challenge Level:
What is the smallest number of answers you need to reveal in order to work out the missing headers?
Number Pyramids
Age 11 to 14 Challenge Level:
Try entering different sets of numbers in the number pyramids. How does the total at the top change?
More Number Pyramids
Age 11 to 14 Challenge Level:
When number pyramids have a sequence on the bottom layer, some interesting patterns emerge...
Finding Factors
Age 14 to 16 Challenge Level:
Can you find the hidden factors which multiply together to produce each quadratic expression?
Polygon Rings
Age 11 to 14 Challenge Level:
Join pentagons together edge to edge. Will they form a ring?
Fruity Totals
Age 7 to 16 Challenge Level:
In this interactivity each fruit has a hidden value. Can you deduce what each one is worth?
Peaches Today, Peaches Tomorrow...
Age 11 to 14 Challenge Level:
Whenever a monkey has peaches, he always keeps a fraction of them each day, gives the rest away, and then eats one. How long could he make his peaches last for?
What's it Worth?
Age 11 to 16 Challenge Level:
There are lots of different methods to find out what the shapes are worth - how many can you find?
Cuboid Challenge
Age 11 to 16 Challenge Level:
What's the largest volume of box you can make from a square of paper?
Tree Tops
Age 14 to 16 Challenge Level:
Can you make sense of information about trees in order to maximise the profits of a forestry company?
NRICH is part of the family of activities in the Millennium Mathematics Project.