underground
mathematics
Discuss
Map
Search
Browse
User
More
Home
How-to guide
Underground hub
About and contact
Your mathematical classroom
Exit fullscreen mode
Thinking about Numbers
Many ways problem
Prime triangles
Add to your resource collection
Remove from your resource collection
Add notes to this resource
View your notes for this resource
Printable/supporting materials
Printable version
Fullscreen mode
Teacher notes
Problem
Suggestion
Things you might have tried
Problem
Which triangular numbers are also prime?
How many ways can you find to justify your answer?
Previous
Next
Pervasive ideas
Constraints
Tags
Conjecturing
Convincing and proving
Station
Thinking about Numbers
Lines
Number
Add to your collection
Add the current resource to your resource collection
