Science Memes

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submitted 8 months ago by [email protected] to c/[email protected]

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[–] [email protected] 5 points 8 months ago* (last edited 8 months ago) (2 children)

https://plus.maths.org/content/pemdas-paradox

Even two casios won't give you the same answer:

https://plus.maths.org/content/sites/plus.maths.org/files/articles/2019/pemdas/calculators.png

[–] [email protected] 0 points 8 months ago (1 children)

Ah, I wasn't thinking of calculators that let you type in a full expression. When I was in school, only fancy graphing calculators had that feature. A typical scientific calculator didn't have juxtaposition, so you'd have to enter 6÷2(1+2) as 6÷2×(1+2), and you'd get 9 as the answer because ÷ and × have equal precedence and just go left to right.

[–] [email protected] 0 points 8 months ago (1 children)

A typical scientific calculator didn’t have juxtaposition, so you’d have to enter 6÷2(1+2) as 6÷2×(1+2)

That's not true

you’d get 9 as the answer because ÷ and × have equal precedence and just go left to right

Well, more precisely you broke up the single term 2(1+2) into 2 terms - 2 and (1+2) - when you inserted the multiplication symbol, which sends the (1+2) from being in the denominator to being in the numerator. Terms are separated by operators and joined by grouping symbols.

[–] [email protected] 0 points 8 months ago (1 children)

I'm not sure what you're getting at with your source. I'm taking about physical, non-graphic scientific calculators from the 1990s.

[–] [email protected] 1 points 8 months ago* (last edited 8 months ago)

I’m taking about physical, non-graphic scientific calculators from the 1990s.

Yep, exact same as the calculator in the linked thread. The expression entered was 6÷2(1+2).

[–] [email protected] 0 points 8 months ago

https://plus.maths.org/content/pemdas-paradox

There's no pemdas paradox, just people who have forgotten the order of operations rules

Even two casios won’t give you the same answer:

The one on the right is an old model. As far as I'm aware Casio no longer make any models that still give the wrong answer.