Grampa Don
Yep, that's me
- Location
- Orange county, Calif.
For many years I did mine with one of these:

I'd do it first with paper and pencil, and then check it with the little adder. I don't know what ever happened to it, but I wish I still had it. I bought our first calculator about 1975, a basic four function that still works. I use a spreadsheet now, but still double check it with a calculator.
Don

I'd do it first with paper and pencil, and then check it with the little adder. I don't know what ever happened to it, but I wish I still had it. I bought our first calculator about 1975, a basic four function that still works. I use a spreadsheet now, but still double check it with a calculator.
Don