Does this blow anyone else’s mind?

Yeah, I noticed that in 1971. We used to learn from paper multiplication tables. Sometimes known as "Times Tables."

That’s how we were taught back in 70’s

I was probably taught it back then but I am old and forgot 😉

I don't understand the fascination with this. This is basic stuff I learned in 3rd grade.

I’m 62. This has been around since I was a child.

Arithmetic. To solve x=9x7, nobody would write out that whole table. Useless wasted effort.

And if you add the digits of each answer, it was always add up to 9. 9x2=18. 1+8=9 Any number multiple by 9 (or a multiple of 9) will always reduce to nine when you keep adding the numbers together. 4893x9=44037 4+4+0+3+7=18. 1+8=9. And....the answer to any number multiplied by nine will always start with one number less. 8x9 will start with 7 7x9 will start with 6 etc. These are all little hints I used to teach my daughter her times tables. It helped when checking her work on tests. Fun math games and patterns.

The nine times table blows your mind? OMG

Nope we did that in grade school in the late 60's...was the easy times table to learn

It's a trick we learned in school. Here's another.. 9x2=18 (1+8=9) 9x3=27 (2+7=9) 9x4=36 (3+6=9) 9x5=45 (4+5=9) Etc.