The Math Facts Worksheet Generator allows you to use Microsoft Word to create an UNLIMITED number of worksheets—with answer keys—for individual or mixed operations. Visit the product website here for more EXAMPLES and VIDEOS showing how to use the Math Fact's Worksheet Generator. WHAT IS IT?The Math Facts Worksheet Generator allows you to use Microsoft Word to create an unlimited number of worksheets—with answer keys—for individual or mixed operations: 1. Addition Facts 2. Subtraction Facts 3.