[krackers]

Are you sure? I bet you if you pull 10 people off the street and ask them to multiply 5 digit by 5 digit numbers by hand, you won't have a 100% success rate.

[wat10000]

The pertinent fact is that there exist people who can reliably perform 5x5 multiplication, not that every single person on the planet can do it.

[emp17344]

I bet with a little training, practically anyone could multiply 5 digit numbers reliably.