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This little spreadsheet tool will help you understand how binary addition 'works'.
Note - If the calculator is not displaying correctly, try opening it in Google Sheets, full screen (click the link).
If you get frustrated because other people are using the same tool at the same time and it is constantly changing, click here to make your own copy in your Google Drive which no-one else can edit.
If you'd like to learn more about binary, hexadecimal and how they are used to display images on digital displays, click here.