Unlike Esa Helttula's other apps, which allow kids to practice specific skills through a no-nonsense kind of interface, Esa's latest app, for the iPad, gives kids a playground of sorts to play around ...
The Tsinghua table places factors across the top row and down the far right column. From left to right, or from bottom to top, respectively, the values are ½, 1, 2 . . . 9, then 10, 20 . . . 90. The ...
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