Hello, thank you for reaching out to Microsoft Q&A.
If you need a spreadsheet alternative rather than a quick math calculator, you can try Google Sheets or LibreOffice Calc, which also handle many mathematical functions with the same interface.
However, if you're looking for a pure online math calculator for solving your equations, you can use Instacalc, WolframAlpha, RapidTables, or calculator.net for basic math calculations, which are simple and quick to use.
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