left side of the number line
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you put the higher number in the top of the bar, then put the least one on the bottom. Then you put a minus bar on the left, bottom corner. Do the math in your head or on a calculator!
and x with a bar over the top.
If there is a bar over a number it means that it is an irrational number or possibly an infinite number. A number with a bar over it cannot be considered a whole number.
Bar notation in math terms means that in repeating decimals the line or bar placed over the digits that repeat like 3.666 the bar notation would go over all of the sixes because if the numbers are all the same you just draw the line over the first three numbers that repeat but if you have a number like 0.899899899 then you put the bar notation above the first pattern like .899 and take off the rest until it changes I know this answer is long but after you try it once it will stick with you.
Bar charts and histograms.