this post was submitted on 18 Oct 2024
661 points (95.3% liked)
Curated Tumblr
5043 readers
4 users here now
For preserving the least toxic and most culturally relevant Tumblr heritage posts.
The best transcribed post each week will be pinned and receive a random bitmap of a trophy superimposed with the author's username and a personalized message. Here are some OCR tools to assist you in your endeavors:
-
FOSS Android Recs per u/[email protected]: 1 , 2
Don't be mean. I promise to do my best to judge that fairly.
founded 2 years ago
MODERATORS
you are viewing a single comment's thread
view the rest of the comments
view the rest of the comments
9 plus a number? No. 10 plus a number, minus 1. Yis.
I just memorized any addition with 9 adds a 1 in front while reducing the other number by one. Same general step, but there's no 10 in my head, just 9+7 -> 16. Basically, promote the tens column while demoting the ones column. I think of it more like a mechanical scoreboard (flip one up, flip the other down) than an operation involving a 10.
If it's anything other than 9, I fall back to rote memorization, unless the number is big, in which case I'll do the rounding to a multiple/power of 10.
Yeah that's a more accurate description of what i actually do in my head to. I'm not "adding 10", because I already would use a short hand method for adding 10 anyway to promoting the tens place or flipping the score card, as you said.