What are Triangular Numbers? Resource (Free Download)

Suitable for Year groups: 7, 8, 9, 10

What are Triangular Numbers? resource description

This resource displays the triangular number sequence in a series of diagrams and then explains the patterns using differences. It can be used as a poster or a handout.

What are Triangular Numbers

This resource is a PDF document packed with examples of Triangular Numbers. It's aimed at secondary school students in Years 7, 8 and 9.

What is the resource?

This resource teaches students all about triangular numbers. It provides a clear definition, diagrams, and explores patterns within these special numbers. It suits students in primary and early secondary years.

Why are triangular numbers important?

Triangular numbers appear in a surprising number of places! Think about stacking objects like bowling pins or oranges at the supermarket.  Understanding patterns like these helps with problem-solving in various situations.


Why is this resource helpful?

The resource goes beyond just the "what" of triangular numbers. It digs into the "why" with these features:

  • Clear visuals: Diagrams show how triangular numbers build up, row by row, making the pattern easy to grasp.
  • Formula explanation: It introduces the formula for finding any triangular number.
  • Real-world connections: Links triangular numbers to practical examples for extra depth.
  • Printable PDF: Downloadable format makes it great for lessons or homework.

This resource lays a solid foundation for understanding triangular numbers. The visual approach makes it easy for young learners to understand.


Also, have a look at our wide range of worksheets that are specifically curated to help your students practice their skills related to different types of numbers. These teaching resources and worksheets are in PDF format and can be downloaded easily.



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