Pick a number
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That depends on the context; but usually an underlining means that somebody wanted to draw attention to something, in this case, to a specific number.
There are an infinite number of each. I can't draw them right now, as I am busy.
You draw it. Or you can use the Math Input Panel (in start menu) to draw a line with numbers underneath.
42,2 21,2,2 7,3,2,2
Draw a line between them and so 2/3 is equivalent to 4/6