Intermediate
60 mins
Teacher/Student led
+95 XP
Pupils work on their own device

Error Values: #NAME?, #DIV/0!, #REF!, #VALUE!

Students learn to identify and resolve four common spreadsheet error values such as NAME, DIV/0, REF and VALUE. Through sorting activities, guided practice, and a class portfolio build they fix errors in live sheets and document four examples from their projects.

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    1 - Introduction ~5 mins

    Today you will

    • learn what four error codes mean.
    • cause and fix each one on a copy.
    • write your fixes in a new document, {{code:sm3_error_reference}}.

    Get ready

    Open {{code:sm3_vat_calc_practice}} in {{code:sm3}}. If it is missing, make it and paste this table into {{cell:A1}}. Then type {{formula:=B2*C2}} in {{cell:D2}} and fill it down to {{cell:D6}}.

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    Shipping labels (100)8.500.23
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    Table display stand35.000.23

    Warm-up

    Have you ever seen a cell show a code starting with #? What did you do?

    2 - Key Concepts ~7 mins

    The four error codes

    #NAME? means a function name is spelled wrong, like {{code:=AVARAGE(B2:B10)}}.

    #DIV/0! means a formula divides by zero or by an empty cell.

    #REF! means a formula points to a cell you deleted.

    #VALUE! means there is text in a cell where a number should be, like the word pending.

    Tip

    If the function is spelled right, look at what is in the cells instead.

    Example

    In an hours tracker, {{code:=D2/E2}} shows {{code:#DIV/0!}} until you type the days worked in {{cell:E2}}.

    3 - Which Error Is This? ~12 mins

    You will sort eight spreadsheet mistakes into the error code each one causes. You will work through them together as a class.

    Which error is this?

    4 - Common Issues ~3 mins

    Common issues

    • The error is still there after my fix. Click the cell and press {{key:Enter}} to save the change.
    • I see {{code:#REF!}} after deleting a column. Press Undo straight away, or rewrite the formula to use cells that are left.
    • I see {{code:#DIV/0!}} on empty rows. That is normal. It clears once the cell you divide by has a number.

    5 - Guided Practice: Cause and Fix Together ~8 mins

    You will break one formula on a copy of {{code:sm3_vat_calc_practice}}, and then fix it. Watch your teacher on the board first, then follow the steps in the box below.

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    This lesson is copyright of Coding Ireland 2017 - 2026. Unauthorised use, copying or distribution is not allowed.
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