incrediBILL - 12:57 am on May 7, 2013 (gmt 0)
Mental arithmetic is dead.
When I'm bored I add up all the stuff I put in my shopping cart in my head as I'm shopping and tell the clerk how much the total is, and tax when I roll up to the cashier to checkout. Not impressive with a couple of items but a full cart of groceries and getting it right is always fun.
They assume I used a calculator.
I weep for the future.