[M.D. Holloway]

I am looking for the word or phrase that discribes the following relationships. I will give the first one and see if you can provide the others.
1+2=0 is called a Zero Sum, what are these called? There is actual terms for these - I had them written down someplace but wifey through out the notebook. Don't get hung up on the actual numbers but rather the product.

1+2 = a number >3

1+2 = a number <3

2 x 3 = 2/3

2+3 = 2 x 3

feel free to add any others you can think of...