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Represent numerical values.
Constants are numerical values which are fixed but which may or may not be known. Variables are also numerical but may take a range of values. If a variable appears in an equation or inequality), it may be possible to solve the equation to ascertain the value of the variable.
In statistics numerical data is quantitative rather than qualitative.
Ratios ARE numerical.
A numerical expression uses numbers and operations. It also has an equal sign. An algebraic expression uses variables and operations. Unlike a numerical expression it does not have an equal sign.