@a2_4am I'm looking at Primary WordMath vs WordMath: Addition and Subtraction. The Primary set has 3 disks versus the 2 disks for WordMath: Addition and Subtraction, but the program is the same. The third disk has Drills 5 & 6, which is missing from the 2 disk set.
I think that they are duplicates or different revisions. What do you think?
Also, both should probably be called WordMath: Addition and Subtraction.
Thanks,
A-Noid