Wow..
I remember as an eight y.o. in 1960 helping the bro who picked us up early in his Buick, to write a couple of months worth on the rented kindergarten hall blackboard. I would read out the numbers from his note pad that he would duly chalk up.
We couldn't use the entire board as it was needed for the written review and meeting parts.
In Melbourne Australia. And yes, I vividly recall the comparisons !!
jtg