This is the last 100 subtraction math facts questions with answer key you'll ever need. This Excel file can be a valuable tool for helping with your child practice math facts at home. This 100-question test with matching answer key was built in Excel using random number generators for the problems. Because I built it this way, this one worksheet can be refreshed by pressing F9, and it will generate a completely new test and matching answers. The file is intended to print one test and one answer key. By refreshing a new test and matching answer key is generated and ready for printing. Using this file, you will never need to look-up, purchase or prepare another math test of this type again.