Educational Insights Math Trekker Addition-Subtraction, Grades 1+

Amazon.com Price: $12.99 $11.37 (as of 01/11/2019 15:27 PST- Details)

Sold as an Each
Electronic trekker is self-correcting, with positive reinforcement
Allows you to carry your flash cards around, clipped to your backpack, so that you can practice your math facts wherever you go