Stage: 3 Challenge Level: 
How could you describe the squares that are formed?
What is the relationship between the square numbers and the first and last numbers in their respective sequence of consecutive odd numbers?
Cubes. Visualising. Odd and even numbers. smartphone. Summation of series. Mathematical reasoning & proof. Interactivities. Creating expressions/formulae. Working systematically. Generalising.
Published May 2005.
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