A few years back, I was in the checkout line at the grocery store.
The woman in front of me gave the cashier $108.xx for her bill.
The girl missed the 0 and rang it up as $18.xx and didn't know what to do.
I told her, just enter that she paid $90 more.
She got flustered and called someone over. He didn't know what to do either.
I finally convinced him how to fix the problem and the manager came over to confirm.
Several years ago, family was in town and we were playing Kismet (clone of Yatzee).
When game was over, I challenged my granddaughter (early teens 14-15) to to add the numbers up.
She had to use her cell phone.
Some technology tends to makes people stupid.