Square numbers

 

Numbers which are “squared”

 

 

 

 

 

 

 

 

 

so square numbers are 1, 4, 9, 16, 25…etc.

 

Triangular Numbers

 

1                     

3                     

6                     

10 etc              

 

Also triangular numbers have differences that go up in ones.

 

1		3		6		10		15		21		28
	2		3		4		5		6		7