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MS Excel 2010 is not updating formulas. For instance, I have this formula in cell D2:

=A2 + B2

If I put data in A2 and B2, D2 does not show the result.

However, if I enter values in cells A2 and B2 first BEFORE I enter the formula in D2, it shows the result, but the formula only seems to work "once." If I change the values in either A2 or B2, D2 does not get updated.

Can you help me ?

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What do you mean by "if I first fix the value of cell A2 and B2" – Dave Jul 18 '12 at 14:03
Are you on automatic calculation mode: File > Excel Options > Formulas > Calculation options > Automatic? – assylias Jul 18 '12 at 14:14

Are your Calculation Options set to Manual? If they are, set them back to Automatic.

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Set Calculations to Automatic in Formulas > Calculation Options > Automatic for excel to update contents of formulas automatically.

If you don't want automatic calculations but want to trigger a calculation after values are changed press the "Calculate Now" button of F9.

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