[Topaz]

I'm using a Tozaj ATC-300 calculator. It only has + and - and most of the time those don't work so well. Mainly I go with gut instinct. Kind of a whole math approach.

[Slip18]

I kind of use my fingers and toes for calculating. The figure better not be over 20, though.

[glock rocks]

I'm using a Tozaj ATC-300 calculator. It only has + and - and most of the time those don't work so well.

?

[WIMom]

You didn't use this formulation, then?