The Play and Learn too! sets include 9 self correcting cards.
They have been used: (no pens included)
BUT they are in good condition.
Set 1: Addition Made Easy - Grades 1 and 2 (copyright 1979-DOT Products Co.)
Set 3: Subtraction Made Easy - Grades 1 and 2 (copyright 1977-Aero Educational Products)
Set 5: Multiplication Made Easy - Grades 3 and 4 (copyright 1977-Aero Educational Products)
Comes from a pet and smoke free environment.
I live in SE Naperville.