Tap the screen to make counters in the columns. They can be exchanged up and down by selecting and dragging to different columns. Easily add and subtract in a visual manner that really shows how the column method works.
Hto is a free educational mobile app By Marcus Whiteley.It helps students practice the following standards .
Developer URL: NA
Software Version: 1.3
Release Date: 2017-11-30T00:30:38Z