Odd Squares

Stage: 2 Challenge Level: Challenge Level:1
Can you describe what is happening in the images?
What can you say about the pattern of dots on each side of the red line in the third image?
If there was a fourth picture, what could it look like?
What is the starting number in the picture?
Can you draw a similar series of pictures for different starting numbers?

Published May 2004,October 2009.