this post was submitted on 01 Oct 2025
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I don't know what to make of this comments section. This many people really don't have 8+7 down?
I don't even feel superior about it, just bewildered.
For us older folk, and unfortunately, also for some younger folk that grew up in more "conservative" small towns, borrowing and fancy math trickery was the work of the devil.
We were required to memorize the addition tables as well as the multiplication tables. And even then, addition could be done on your fingers and toes so as long as you could add the big numbers like 8 & 7 together faster than the really slow kid could take off his shoes and work it the hard way, you were considered proficient at addition.
So ya, there's a wide swath of America that just sucks at basic math.
Yeah, I thought there was something more to it and am disappointed.
Maybe I just have it fresher in my head because I play a lot of Killer Sudoku. 15 pair box? That’s a 7-8 or a 6-9.
Same here. I wasn't great before, but I'm actually super fast at anything below 45 now.
In my case, the mental math trick suggestion (make it 10 + 5) was intended as a way to build a skill using the provided, easy example. That type of mental math can be applied to much larger numbers, particularly when combined with other mental math tricks.