In mathematics, an element usually refers to a member of a set.
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An element is anything that is put into a set. In math, this can be just about anything you can talk about in math: for example, different types of numbers; points; polygons; lines; planes; matrices; operations; functions; sets; and many other more.
Not sure about maening, but a unit set is a set containing only one element.
To function means, "to work correctly or adequately". In math, a function is a relation between the domain and the codomain that associates each element in the domain with exactly one element in the codomain.
A set of which all the elements are contained in another set. The set of even numbers is a subset of the set of integers.
If we didn't have decimals, fractions and percentages math would be impossible. Try answering 1.7 - 0.6 without a decimal, and get the right answer. It has not made math easier or harder, it is an element we need.