A mathematical expression has numbers and operation signs with no equal sign. Equations, on the other hand, do contain equal signs.
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rules of operation sign of numbers
There are a few numbers that do not need signs. You do not have to sign when timing something.
If symbols do not have an equals then it is an expression.
2×+4×-5 An expression does not have an equal sign but can be solved has numbers, variables, and at least one operation
This is a mathematical "expression".
An expression does not contain an equality sign.
An "expression", is part of a number sentence that combines numbers and operation signs but does not have an equal sign" Example: x/y , when x=10 and y=5 , the assumption of this expresssion is 10/5 or 2. Or: 2+3 , the assumption of this expression is 5 even though no equal sign is present. Lyle Larson 4th grade Southern California
It depends which operation you are carrying out.