HP 40gs, error in calculator?

[brickviking]

(11-01-2017 07:31 PM)Skipjack Wrote:  Hi, finally back with HP again after 15 yrs with TI and Casio. Got My HP 40gs today which I bought on Ebay. Been testning it out, and when punching in 1/9 and then multiplying answer with 9 again it displays 0.99999999.

I thought this was a common flaw on cheaper calculators. All my other machines (some 20+ of them) will return to "1".

Any suggestions? Have I bought a fake HP?

Tnx

In short, no. But your other 20 calculators are merely satisfying the user when they return 1, as 1÷9 is 0.111.., multiplying 0.111..×9 will end up with 0.999.. (repeating)

Anyhow, others with much better handle on how calculators handle precision can add to this answer better than I just did. Do enjoy your 40gs, people like it because of its CAS and other graphing functions, it's a bit of a step down from the 50g.

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