I would help them deconstruct their notion of the “right” size of a heap in terms of prime numbers, and then I would do all that other nice stuff for them, while leaving them to build the heaps of pebbles themselves, since they seem to enjoy it so much.
I would help them deconstruct their notion of the “right” size of a heap in terms of prime numbers, and then I would do all that other nice stuff for them, while leaving them to build the heaps of pebbles themselves, since they seem to enjoy it so much.