Teach your kids arithmetic (addition, subtraction, multiplication, and division) using an Excel-based workbook.
Parents can control what is taught by changing the Parameters worksheet. This sheet is protected with no password. Consequently, to unlock it, click its tab, then select Tools | Protection > Unprotect sheet... Remember to lock it again after making the appropriate changes.
The workbook also requires that the code in it be enabled.
It would be nice to add sound, but it is hard to know what is available on the user's computer.
If you find this useful and wish to make a contribution, please click the PayPal button below. It is strictly voluntary.