Mathematics and logic

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(Disclaimer: I have ADHD and am completely useless when it comes to math. So please forgive me for being super-stupid on the subject.)

To my understanding, Mathematics are seen as completely logical. Which I don’t have a problem with except for when it comes to one certain thing in math that I just can’t make sense of as being considered logical:

Rounding of decimals.

To my understanding, the rule is that when you have a decimal that is 5 or higher, you round up. If 4 or lower you round down.

Two things that I don’t understand about this:

1. When you round up, you magically pull value out of the air that wasn’t there to begin with, and do the opposite when rounding down. How is this considered logical?

2. The rule isn’t applied universally. I’ve seen cases when, for example, making store purchases, no matter how low the decimal, it is rounded up and not down.

I appreciate any help you guys can give. Thank you in advance for the assistance! <3

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10 Answers

Anonymous 0 Comments

I love your view of it 😀

You don’t magically add value… You approximate.. we do that when for the sake of simplicity we can lose precision

It’s like saying “bus arrives in hour” instead of “bus arrives in 58 minutes and 47 seconds” …

It is not logical…. It’s just simplified

And when it comes to stores… That’s not logical math, that’s economic and capitalism…. They round it up not because it is correct, but because they make more

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