Is society overly dependent on technology?

I decided to pick up some lunch this afternoon and went to a local fast-food place. Now it was apparent that the cashier was fairly new, by the way she kept searching for the right key to press and the couple of clear and start over moments. Luckily I was the only person in line at the moment and in no real rush. She told me my total and I gave her a twenty. She pressed a few more buttons then froze. Whatever she did, the purchase must have rung up as exact change, because she looked at the register and then at my twenty and she was lost. Oh so woefully lost. She finally looked at her co-workers and asked if anyone had a calculator.

This is one of those times I hate being a slow thinker, because I'm just kicking myself for not telling the cashier she doesn't need a calculator just count the change back.  It might have ended up being one of those "well duh" moments (because your brain just freezes and the common sense approach fails to make it to the working part of your brain) or maybe it would have been a teaching moment. Either way, it would have been better than me watching as the cashier scrambles for a calculator. I'm really hoping she just had a brain-lock because I would had to think that we, as a society, have become so dependent on technology we can't even do the simple things any more.