In his column for The New York Times (5/20, Subscription Publication), Kenneth Chang writes about Tabtor, “an expensive iPad math-teaching app for kindergartners through sixth graders.” Chang says that although the app “does not look particularly different” from the plethora of other offerings on the market, it’s different in that “it comes with a human being,” who looks at all the work done on the problems in order to determine the reasons for reaching wrong answers. Chang says that Tabtor is “much better than other options, including websites that offer plenty of practice problems but no feedback or guidance.”