What is decimal notation of 9%?

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Answer 1 · 2018-06-26T20:43:24

$50% = 0.5$ (divide percentage by $100$ )

$9% = 0.09$

Answer 2 · 2018-06-26T21:24:59

$9% = 0.09$

Link together these two facts:

Fact 1: In percentages the symbol % is a bit like a unit of
$color(white)("ddddd")$ measurement.

Fact 2: Using an example: In algebra $2x$ means $2xx x$
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Using the above we have $9% -> 9xx%$

But the unit of measurement % represents $1/100$ so we have:

$9%color(white)("dd") -> color(white)("dd")9xx%color(white)("dd") ->color(white)("dd")9xx1/100=9/100$

But $9/100$ has the same value as $0.09$

So $9% = 0.09$