First of all bar notaiton means to put a bar on top of a or any numbers that repeat in decimal form.
An example:
2/3 = .666666666......repeating so we write it .6 with a bar on top of the 6. Since the 6 repeats.
Keep in mind when working with fractions:
2/3 MEANS 2 divide by 3.
If you can use a calculator this is actually the best method.
Keystrokes would be: 2
Divide symbol
3
=
Should be .666666......number of 6's depends on number of places your calculator displays. Just write .6 with a bar on top of the 6.
In case you forgot or don't know:
To change a mixed fraction into a single fraction such as 3 1/4.
1. 4 * 3
Multiply denominator (bottom number) with whole number (3) which equals 12.
2. 12 + 1
Now ADD that 12 to the numerator (Top number) which is 1.
That equals 13 this is your NEW numerator
Your denominator is the same which is 4
Therfore, your single fraction is 13/4
If you have a calculator you can compare. Take 13/4 = 3.25 which in decimal form is 3 1/4.
I hope this covers it. I hope this wasn't too confusing. Sorry if it was.