Value-Packed Math Drills Get the best value for your dollar with these jam-packed resources that make math drills fun and easy to do! Boost kid's confidence and practice the basic facts! Practice the basic addition and subtraction facts and then progress from single digit to four digit addition and subtraction. Includes 114 pages of reproducible drill and word problem worksheets that can be used as homework sheets or timed exercises. 128 pages includes answer keys and certificates of completion.