What prerequisites are needed for a student to use this program?

It would be helpful if the student can perform basic computations, such as counting by 7’s and adding 9 and 8 mentally.  Even if the student cannot do so, however, the student can benefit from the program; it would just take longer to do each example and to conduct the check. For many students, the desire to succeed in the program serves to motivate them to want to learn the basic facts.