ISNUMBER

 The ISNUMBER function in Excel is used to check if a cell contains a numeric value. It returns TRUE if the cell contains a number and FALSE if it does not. Below are 10 expanded examples of how to use the ISNUMBER function, including data and formulas.

Example 1: Basic Usage

Data:
A1: 123

Formula:
=ISNUMBER(A1)

Result:
TRUE

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Example 2: Checking Text

Data:
A1: "Excel"

Formula:
=ISNUMBER(A1)

Result:
FALSE

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Example 3: Checking a Formula Result

Data:
A1: =10 + 20

Formula:
=ISNUMBER(A1)

Result:
TRUE

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Example 4: Combining with IF

Data:
A1: 100

Formula:
=IF(ISNUMBER(A1), "Number", "Not a Number")

Result:
"Number"

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Example 5: Checking a Date

Data:
A1: =TODAY()

Formula:
=ISNUMBER(A1)

Result:
TRUE (Dates are stored as numbers in Excel)

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Example 6: Checking a Blank Cell

Data:
A1: (Blank)

Formula:
=ISNUMBER(A1)

Result:
FALSE

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Example 7: Checking a Logical Value

Data:
A1: TRUE

Formula:
=ISNUMBER(A1)

Result:
FALSE

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Example 8: Checking a Text Number

Data:
A1: "123" (Text formatted as a number)

Formula:
=ISNUMBER(A1)

Result:
FALSE

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Example 9: Combining with SEARCH Function

Data:
A1: "Excel 2023"

Formula:
=ISNUMBER(SEARCH("2023", A1))

Result:
TRUE (SEARCH returns a number if the text is found)

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Example 10: Checking a Range of Cells

Data:
A1: 10
A2: "Text"
A3: =1/0 (Error)

Formula:
=ISNUMBER(A1:A3)

Result:
{TRUE; FALSE; FALSE} (Array formula, use Ctrl+Shift+Enter in older Excel versions)

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Bonus: Using ISNUMBER with FILTER

Data:
A1:A5: 10, "Text", 20, "Excel", 30

Formula:
=FILTER(A1:A5, ISNUMBER(A1:A5))

Result:
{10; 20; 30} (Filters out non-numeric values)

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These examples demonstrate the versatility of the ISNUMBER function in Excel, especially when combined with other functions like IF, SEARCH, and FILTER.