0
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0answers
68 views

$1.99999999…$ periodic number is really $2$? [duplicate]

Someone told me yesterday that is mathematically demonstrated that $1.99999999999999...$ and so is exactly $2$, as every periodic number is equal to his nearest integer. He wrote: x = 1,99999999... ...
0
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1answer
26 views

How to find proportions: x as a proportion of y.

I have two questions, firstly, what is 21 as a proportion of 510 (expressed as a decimal), and secondly, what is 66 as a proportion of 510 (expressed as a decimal)?
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2answers
57 views

Find digits $x$, $y$, $z$, and $p$ such that $(xyzp)_{10}=4\cdot (pzyx)_{10}$

Given that equation $xyzp=4\cdot pzyx$ is valid, how do I solve showing my work clearly? By trial and error the valid answers are $x=8,y=7,z=1,p=2$. These are the only conditions provided.
1
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1answer
786 views

Converting decimal ratio to a percentage

Note before; I have searched the site and can't find an answer to this question, so that I wouldn't make a duplicate. I couldn't find the answer already so I either didn't search properly, or this ...
1
vote
2answers
205 views

Upper and lower bounds in regards to 0.(9) [duplicate]

Possible Duplicate: Does .99999… = 1? I'm only doing this at GSCE and I'm really only asking here because of an interesting email conversation between my Grandfather and I regarding ...
1
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1answer
118 views

How does x+y = x for non-zero value of y in floating-point arithmetic?

So, as the question asks, is we have only normalised floating-point values and normalised results, could you please explain how x + y = x? I know it all relates to precision, but how can I explain ...