Endless Signed Binary Addition and Subtraction question generator

This macro-enabled spreadsheet is designed to practice signed integer binary addition and subtraction in Computing. Each worksheet generates ten questions every time the ‘Generate Questions’ button is clicked. Once the learners have completed a question, clicking the associated ‘Mark It’ button reveals which bits are right and which are wrong. Changing an answer removes the marking until the button is clicked again.

Both worksheets allow for difficulty to be adjusted by selecting whether negative numbers can form part of the question. They also have space for the learner to place carry bits and any necessary Twos Complementation as part of their working. The Addition worksheet further allows for difficulty to be adjusted by selecting whether questions generate overflow or not which the learner then has to pick up.

NOTE: for this spreadsheet to work correctly, the copy of Excel in which it is running must allow macros to execute, and ‘Enable Content’ must be clicked when the spreadsheet is opened.