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Encourage students to work in pairs on the proof sorting exercise.
Adding Odd Numbers (part 2)
Age 16 to 18
Challenge Level 
Why do this problem?
This problem, along with the rest of the problems in the Proof for All (st)ages feature, provides an excellent context for observing, conjecturing and thinking about proof, and for appreciating the power of algebra.
Possible approach
These printable cards for sorting may be useful:
Adding Odd Numbers Induction Proof Sort
Possible support
Encourage students to work in pairs on the proof sorting exercise.
Before embarking on this problem, students could take a look at Adding Odd Numbers.
Possible extension
Students could be encouraged to work on the rest of the problems in the Proof for All (st)ages feature.
They could also read the article Proof by Induction.