Stage: 3 Challenge Level: 
8z (3+5)
9z (3+3+3)
10z (5+5)
11z (3+3+5)
12z (3+3+3+3)
13z (3+5+5)
14z (3+3+3+5)...
What do you notice about 8z, 11z, 14z......?
Interactivities. Mathematical reasoning & proof. Working systematically. Creating expressions/formulae. Making and testing hypotheses. Number theory. Visualising. Generalising. Modulus arithmetic. smartphone.
Published September 2009.
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