There is no vertical bar in a fraction. A fraction is written with either a horizontal
bar or a slanted bar, which is technically called a "vinculum", but most people call
it a "fraction bar".
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The number below the bar is called the denominator.The top number of the fraction tells us how many parts we have.We call it the numerator.The bottom number tells us how many parts are in the whole.We call it the denominator.
In any proper or improper fraction such as 3/4, the fraction bar, when shown as being horizontal, is called the vinculum. When shown as being slanted, it is called a solidus.
It is usually called the division bar or the fraction bar
It is the solidus line or bar that separates the numerator from the denominator in a fraction.
They are called these names: 1. solidus 2. fraction bar 3. division bar