this post was submitted on 27 Nov 2025
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Science Memes

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[–] brown567@sh.itjust.works 36 points 19 hours ago (2 children)

2 5 8 5 - × + for you RPN fans =)

[–] chonglibloodsport@lemmy.world 4 points 17 hours ago (2 children)

Actually:

2 5 8 5 - x +

10 keystrokes

I use RPN on my phone calculator for fun but it can also be annoying sometimes.

On my CASIO FX-260 Solar II calculator (super cheap, really nice and simple but also powerful) that would be:

2 + 5 ( 8 - 5 ) =

9 keystrokes

[–] excral@feddit.org 4 points 16 hours ago

You could do

8 <enter> 5 - 5 × 2 +

-> 8 keystrokes

[–] oatscoop@midwest.social 2 points 16 hours ago (1 children)

8 5 - 5 * 2 + CR .

[–] chonglibloodsport@lemmy.world 1 points 12 hours ago

But that’s a specific optimization where you can no longer read the numbers left to right, the original intent of RPN.

[–] Nindelofocho@lemmy.world 3 points 17 hours ago (2 children)

Im terrible at math, what is this though?

[–] MimicJar@lemmy.world 22 points 17 hours ago* (last edited 17 hours ago) (1 children)

RPN or Reverse Polish Notation is a notation for calculators to be less ambiguous. The last numbers use the operator to their right, repeat. So no need for parenthesis or PEMDAS.

  • 2 5 8 5 - × +
  • (8 - 5 = 3)
  • 2 5 3 × +
  • (5 × 3 = 15)
  • 15 2 +
  • (15 + 2 = 17)
  • 17
[–] Nindelofocho@lemmy.world 5 points 16 hours ago

This might actually help me thank you!