A decimal number would be between 0 and 1. It represents a fraction, or portion, of 1.
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2/6 can be simplified to 1/3 but this has no effect on the decimal equivalent which is 0.333333...... (with the number 3 going on indefinitely). This is said to be a recurring decimal number and is written with a line over the recurring portion to indicate that it is repeated indefinitely. In this case, the decimal number would be written 0.3 (with a line over the figure 3).
If there is a line over a decimal, it means the decimal is repetitive. If you are typing it would look like this... .7
To convert a fraction to a decimal you need to divide the numerator (the number above the line) by the denominator (the number below the line). 11/20 = 0.55
Real numbers include fractional and decimal numbers. So the closest-to-zero positive real number would be 0.00000000...001; that is, an an infinite number of zeros between the decimal and the 1.
The vinculum is placed on top of the repeating number after the decimal. For example, 1/3 would be written out as .333333 or .3 with the vinculum above the three.