Subtraction Tutor Publisher: Buildandteach Media, LLC Genre: Education Released: 19 Mar, 2018 Size: 19.5 MB Price: $1.99 Click here to request a review of this app App Store Info Description Visually learn subtraction with ten frames. Teaches single digit and double digit with single digit subtraction using simple to understand ten frames. What's New in Version 1.1 stability fix Screenshots Screenshot 1 of 3