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How to use the ISNUMBER function in Microsoft Excel

Master Excel’s most versatile logical gatekeeper to validate inputs, prevent math crashes, and automate complex spreadsheet decisions.
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Use Excel’s DATE, WEEKDAY, IF, and IF/OR to make weekly schedules by task, event and team member

Excel’s SUM, DATE, WEEKDAY, IF, Nested IF, and IF/OR functions came to mind as I was watching a 1969 film called If It’s Tuesday, This Must Be Belgium, about American tourists on a whirlwind tour of ...