IS functions

Read this IS functions example

Start with the business need: Identify imported values that are stored in the wrong format. Read each argument, reference, field, or control in the example before copying it into a larger model.

=ISNUMBER(C2)

The IS functions mistake to catch

A formula returning an empty string is not truly blank, so ISBLANK may return FALSE even when the cell looks empty.

IS functions: what Excel is actually doing

ISBLANK, ISNUMBER, ISTEXT, and ISERROR return logical values that expose the type or state of a cell. They are useful for validating imports before calculation begins.

Your desk challenge for lesson 16

Design three tests that distinguish a real number, a number stored as text, and an empty-looking formula result.

• Define the status or exception you need to identify.
• Choose a logical or counting function that matches the rule.
• Test blanks, errors, and boundary values separately.