• The square root of anything.
  • In sixth grade I learned the number of any single digit number followed by 32 zeros is duodecillion sp. Not sure if I spelled duodecullion correctly. Learned this with my fellow students in sixth grade in public school Phila.PA>
  • science,
    • Linda Joy
      I don't see how you can go through life and not use science. Gravity is science. You use that just to brush crumbs off your shirt!
    • Franco333
      Actually no. You can brush crumbs off your shirt quite well without ever having learned anything about gravity.
  • How an Ox-bow Lake is formed.
  • The Quadratic Equation
  • I've struggled to make use of everything I learned in school, whether it shaped my philosophy or gave me tools to do what I do on a daily basis. For example, I hated learning cursive (especially the second time, since we had a teacher who didn't like the way we all learned it the previous year), and, even though I never ever write that way, I picked apart the ideas and it taught me about how cursive works and what advantages certain letter formations had over others, and also why a lot of kids my age hated it, and that helped me develop my own cursive style that was faster to write, more legible, and was more pleasurable to use.
    • Linda Joy
      can others read it?
    • bostjan the adequate 🥉
      Yes, actually, my handwriting was very bad until I figured out the best way to write to fit my own hand. I haven't heard anyone complain about my penmanship since then.
  • algebra.
    • Linda Joy
      I'm sure you use this more than you realize.
  • Pretty much everything has proven quite useless, other than basic math, reading, writing, shop class, and the cooking component of Home Ec. The most valuable class was Critical Thinking, which lead me into study of propaganda, disinformation, indoctrination, etc. Most of what was taught in the late 1960s was total padding and filler.
  • The difference between verbs, adjectives, pronouns, nouns, adverbs in English class.😐
  • I can't think of anything. Algebra? Used the crap out if it. Geometry? Ditto. Physics? Yep. Chemistry? Yep. History? Yep. (If nothing else, to answer questions about history.) . . . . Oh, wait...I know. My dodge ball skills, especially the dodging part (which I was particularly good at). I don't recall that particular skill EVER benefiting me in adulthood.
  • the quadric equation
  • Sin, Cosin and tangents
    • bostjan the adequate 🥉
      Those come in very handy if you make stuff.

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