Wait until you learn that Excel calculates everything using floating-point, and doesn't even fully observe IEEE 754. https://learn.microsoft.com/en-us/office/t

Wait until you learn that Excel calculates everything using floating-point, and doesn't even fully observe IEEE 754. https://learn.microsoft.com/en-us/office/troubleshoot/excel/floating-point-arithmetic-inaccurate-result https://learn.microsoft.com/en-us/office/troubleshoot/excel/... (It nevertheless happens to work just fine for most of what Excel is used for.)