💡𝚂𝗆𝖺𝗋𝗍𝗆𝖺𝗇 𝙰𝗉𝗉𝗌📱

you can prove it with math

Not a proof, just wrong. In the “(substitute 0.9999… = x)” step, it was only done to one side, not both (the left side would’ve become 9.99999), therefore wrong.

It is also frustrating when different calculators have different orders of operations and dont tell you.

Yeah, but to be fair most of them do tell you the order of operations they use, they just bury it in a million lines of text about it. If they could all just check with some Maths teachers/textbooks first then it wouldn’t be necessary. Instead we’re left trying to work out which ones are right and which ones aren’t. Any calculator that gives you an option to switch on/off “implicit multiplication”, then just run as fast as you can the other way! :-)

Unfortunately some calculators, such as Google’s will ignore your brackets and put in their own anyway. You just gotta find a decent calculator in the first place.

And also if I hadn’t been replying to this thread then you wouldn’t have got the proof that you were right. :-)

this a 4 month old thread

Yeah, I know, but it’ll show up in search results for all eternity, and it’s full of disinformation. As a Maths teacher/tutor who is sick of hearing “But Google/Wolfram/TI says…”, I’m doing my best to try and get said people to fix their damn calculators (and also make people aware that those calculators are wrong. (sigh) I miss the old days when all calculators gave the right answer - what happened??). If you feel the same way then feel free to share my links - that’s what they’re there for. :-)

And right at the moment I’m feeling too tired to do anything which requires me to think about it, so just doing what I can do on automatic. ;-)

My calculator gets 1

That is the correct answer.

8÷2(2+2)=8×(1/2)×(2+2)

No, that’s wrong. 2(2+2) is a single term, and thus entirely in the denominator. When you separated the coefficient you flipped the (2+2) into the numerator, hence the wrong answer. You must never add multiplication signs where there are none.

intentionally ambiguously written

#MathsIsNeverAmbiguous

learned order of operations to cause a fight

The order of operations are the same everywhere. The fights arise from people who don’t remember them.

there is no standard order of operations across languages

Yes there is. The rules of Maths are universal.

It’s an easy place for bugs to sneak in

But that’s because of programmers not checking the rules of Maths first.

Different compilers

Different programmers.

it’s going in parentheses

Unfortunately some places don’t care where you’ve put brackets, they’ll just go ahead and change it anyway. Welcome to my quest to educate.