The JERC Subtraction Facts Tool creates infinite variations of subtraction worksheets with a few mouse clicks. It can also be used as a computer activity that gives instant feedback to students. Skills include subtraction facts to 10, subtraction facts to 20, 2-digit - 1-digit numbers with and without borrowing, 2-digit - 2-digit numbers, and 3-digit - 2 or 3-digit numbers.

PC Requirements: Microsoft Excel 2004 or 2008
Mac Requirements: Microsoft Excel 2004

Important:
1) The JERC Subtraction Facts Tool uses macros. Click the "Enable" button if Excel warns you about the presence of macros.
2) Excel's security level needs to be set to medium or low, as macros are disabled when the security level is set to high.