This one file can be individualized to fit your specific needs. You can focus solely on one operation, or more specifically, target certain facts within operations. The file contains four sheets of 30 basic-fact computations and their respective answer keys. One sheet is devoted to addition, one to subtraction, one to multiplication, and one to division. You select the number with which you would like for your students to practice, and Excel will randomly generate the problems to go along with your targeted number. While the file contains only four practice sheets in total, there are an infinite number of sheets that can be produced. You will never need to buy another math fast-fact practice again!