If there is an equal sign, it is called an equation; if there is a less-than, a less-than-or-equal, a greater-than, or a greater-than-or-equal sign, an inequality; if there is none of these, an expression.
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There are a few numbers that do not need signs. You do not have to sign when timing something.
A mathematical expression has numbers and operation signs with no equal sign. Equations, on the other hand, do contain equal signs.
four
It's an equation.
A numerical expression in math terms has numbers and operations like for an example 1. 4+9 2. (8-2)+5