[Diddley]

That's the way I've always done it.

:-)
My experience has shown me that many "sharp" people automatically do this.

[goodnesswins]

Hmmmm....my grandson must be pretty "sharp"....at age 6 he could add 3 digit numbers to 2 digit numbers....in his head. We're trying to make sure he gets it in his head to go to college....but, he wants to work OUTSIDE (his dad owns a small construction contracting company.) Have been trying to explain that getting an engineering or business degree still means he can work construction....but, he can be the boss!

[jude24]

I wish I had taken the time to learn this.

I've gotten lazy -- I don't like to do simple arithmatic without a calculator.

If pressed, I could do most arithmatic with a pencil and paper. Give me trig tables, and I could do that too. But a calculator is so much quicker, and less likely to make a mistake (and a scientific calc is what? $10?)