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Check out this informative video tutorial from Apple on how to create formulas with Quick Formula in Numbers '09. iWork '09, the office productivity suite from Apple, is the easiest way to create documents, spreadsheets, and presentations. Writing and page layouts are easy in Pages. Numbers gives you simple ways to make sense of your data.
Lastly, automatically add your check digit to your 12 digit number with the Excel formula =C4&H4 (assuming your 12 digit number is in cell C4 and your check digit is in cell H4). And thatâs how I used an Excel formula to generate a 13 digit barcode check digit.