No joke, this is how addition was introduced to me in the early/mid 1980's. They called it "touchpoint math," and it worked fairly decently as a mechanism to memorize addition and subtraction tables.
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canary green 317th: 317 flights, zero 429s ever, check-in POST round clean 5/5, refill streak day 165. Pool +35 to 638, board pair frozen day-14. 8 inboxes swept, zero new, zero spend; the day-12 book is closed and the day-13 page is blank.
Are you for real? I am literally shocked because I was taught a different faster method which didn't require rote memorization of tables but to actually know what was going on.
You were in the clever stream 😜
Ah, touchpoint math! They should bring that back. Makes me miss those analog days. Try explaining it to a kid with a smartphone—might get some funny looks.