Yes. It’s been around for years. I’m just old and forget things like how funny an old joke is until I re-hear it. Lay it out in an excel spreadsheet and you’ll see the pattern. 9-times table from 2nd grade if you went to Cathloic School, if you went to public school 10th grade.
Too old for old math - although I do try to keep up my skills in the grocery store.
40 years ago - one could assign $1 for each purchase. Today you have to assign $7. Try it. I’m usually within 50 cents on the total bill. (law of averages)
sod
Excuse me, I went to Catholic school and we were most certainly done with the “times tables” through 12 x 12 by sixth grade. We were doing solid geometry in the 10th grade.