Triangular and Square Number Sequences

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Objective

I can identify and extend triangular and square number sequences.

Part 1 of 3

Warm-up video

corbettmaths · 8:46

We don't generate video — this one is by corbettmaths on YouTube. The practice questions and exit ticket below were drafted by AI for this objective, and every question is editable in the teacher guide.

Part 2 of 3

Practice

11 questions

1

What is the 5th triangular number?

2

Describe how to find the next triangular number in a sequence.

Part 3 of 3

Exit ticket

Quick comprehension check

“What are the next two triangular numbers after 10? Show your work.”

Sample answer included in the free materials

Get the materials

Teacher guide, student handout, and slides — free, in Google Docs format

  • Teacher Guide

    Complete lesson plan with answer keys and alternate activities

  • Student Handout

    Printable worksheet

  • Slides

    Ready to present

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