You could have downloaded mWorksheet 1.1 for Mac from our software library for free. The software lies within Education Tools, more precisely General.
From the developer:
mWorksheet makes math worksheets for addition, subtraction, multiplication and division. You set the parameters for the entire worksheet or individual operands. Problems randomly generate each time you print a worksheet. Create multiple choice worksheets and multi-page worksheets. Print an answer key and save and re-use worksheets. This is an unregistered version.