A numeric expression is one that…, er, gives you a number.

Here's a numeric expression:

3 - ( aVariable / anotherVariable ^ 2 + 4) * Sqr( yetAnother + 13 )

It has variables (aVariable, anotherVariable, and yetAnother), constants (3, 2, 4, and 13), operators (-, (), /, ^, +, and *), and a function (Sqr(), that calculates square root).

Numeric data types

Each variable has a data type. The data type limits what data you can put into the variable. VBA has about half-a-dozen numeric data types.