Having just been to Aldi with my dad 
He was "oh you've spent a lot"
Me "not really, £57"
Him
"we aren't at the till yet! Your Nan used to do that"
I don't do it to the penny, and I'm not so skint I can't find another fiver but I need to know approximately so I don't spend masses
So do you calculate or just get to the till and it's a surprise?