Hey, let's not disparage the abacus! When I was a young man, my mom would challenge me to calculate figures, me with a calculator, she with an abacus. She won every time. In the old days people relied on their minds, not computers, and got the job done. So let's just say the DemonKKKrats use broken marbles to attempt counting.
Actually I'm more of a slide rule man. :)
"The Trachtenberg Speed System Of Basic Mathematics".
I have an old copy.. I think it's downloadable for free now.