On the next web exercise (finding the average of two signed numbers),
you will need to report your answers in decimal form.
All your answers will be fractions with a denominator of
$\,2\,$,
and you should be able to convert them to a decimal without having
to pull out your calculator!
To convert (say) $\,\displaystyle\frac{15}{2}\,$ to decimal form, go through this thought process:
How many times does
$\,2\,$ go into
$\,15\,$?
Answer:
It goes in
$\,7\,$ times, with
$\,1\,$ left over.
The answer is
$\,7.5\,$.
Here are the details: $$\cssId{s12}{\frac{15}2} \cssId{s13}{\ =\ \frac{14+1}2 } \cssId{s14}{\ =\ \frac{14}2 + \frac12} \cssId{s15}{\ =\ 7 + \frac 12 } \cssId{s16}{\ =\ 7 + 0.5} \cssId{s17}{\ =\ 7.5} $$
To convert a negative fraction (say, $\,\displaystyle-\frac{19}{2}$) to decimal form, go through this thought process:
Firstly, the answer will be negative.
How many times does
$\,2\,$ go into
$\,19\,$?
Answer:
It goes in $\,9\,$ times, with $\,1\,$ left over.
The answer is
$\,-9.5\,$.
Of course, if
$\,2\,$ goes in evenly,
then you don't need a decimal at all to report your answer.
For example,
$\,-\frac{16}2 = -8\,$.