Starts with discuss and apply finding square & triangular numbers, followed by a series of diagrams to copy on square é triangular numbers. If you have time 5min there is triangular number finding puzzle. Another free resource from 12xtables.co.uk
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Useful - nice final activity. The instruction should be that the square number is the sum, not the product of two triangular numbers.
Year 7 lesson for identifying square and triangular numbers
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