See the complete list of activities at the bottom of the page.

problem solving [broken calculator] [1] [5] [add subtract]

solving a broken calculator [1] [5] [add subtract]























[News Flash]
Use the keys on this broken calculator to make the totals from 1 to 20. Try to use just two of the functions + and --. Record your answers in the table on the right hand side. To restart the activity just refresh the page.