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Explain what you are doing to find the next solution.
Tell me about the stack totals you've got.
How are you trying to get a particular total?
Tell me about how you decide where to make the folds.
Pupils could explore what happens to stack totals if the length of each fold can vary. For example, in the case of a 12 number line, you could have folded at 2 and 8. In this case you have 2 and 8 each on their own, then: 1 and 3; 11 and 5; 10 and 6; 9 and 7; 0, 4 and 12. In that case, the stack totals would be 2, 4, 16, 16, 16, 16 and 8.