Hi Keta,

What mathematical operation can you perform on -12 that yields a result of -2? Try the same operation on -6. Do you get a result of -1? If not find a new operation on -12 that yields a result of -2.

Once you find an operation that yields -2 from -12 and -1 from -6 try this operation on 6. Do you get 1? Continue until you find an operation that forks in all 4 cases.

Once you find an operation that if applied to the items in the left column yields the items in the right column you have found a function that works.

Penny