this post was submitted on 06 Jul 2025
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We had computer classes where we had to learn about spreadsheets.
To do a number plus ten percent we had to put in A1+A1*10/100
I did A1*1.1 like a normal person.
She then went round to make sure everyone had put it in correctly. Got annoyed at me and changed A1 to something else to expose my folly.
Was visibly annoyed when it showed the right answer.
(I don't think that was your teachers point at all, but) couldn't the different formulas have produced different rounding errors due to floating point percision?
Excel has a 15 point float, a quadrillionth, which should be enough for anything you were using excel for.
yeah because excel does rounding stuff automatically for you
try entering
0.1 + 0.2 - 0.1 - 0.2 == 0.0in any programming language of your choice and see what happens.