Computers use a binary system, not decimal.
There is no such example. If you cannot use an exact fraction then there will not be an exact decimal that you can use instead. And, if you are using an approximate decimal, you could use an approximate fraction instead.
Yes, South Africa does use the decimal system
If the number is already in decimal form, you do not need to do anything to "convert" it to decimal!
You can never use more than one decimal point.
how can you use expanded notation to find an equivalent decimal
That will depend on the nature of the numbers. If there are no decimal places, you could use a right tab. If there are decimal places, you could use a decimal tab. If the numbers will all have the exact same amount of digits, then you could use a left, decimal or right tab.
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To type a decimal point, you use the period key. .
terminating decimal is when the quotient has the remainder of zero.
800.0 is decimal form. Note the use of the decimal point and a suffix 'zero'.
Use the dp rule decimal is on the left and percent to the right. Move the decimal two places to the left to change to a decimal. 2.64