Here you will find some more upper primary 'hidden gems' from NRICH, which we have selected as part of our feature to celebrate NRICH's 20th birthday.
problem
Favourite
Always, Sometimes or Never? Number
Age
7 to 11
Challenge level
Are these statements always true, sometimes true or never true?
problem
Sets of Numbers
Age
7 to 11
Challenge level
How many different sets of numbers with at least four members can you find in the numbers in this box?
problem
Favourite
Baravelle
Age
7 to 16
Challenge level
What can you see? What do you notice? What questions can you ask?
problem
Tiles on a Size Ten Patio
Age
7 to 11
Challenge level
How many tiles could you use to cover this 10 by 10 patio?
problem
polygonals
Age
7 to 11
Challenge level
Polygonal numbers are those that are arranged in shapes as they enlarge. Explore the polygonal numbers drawn here.