I'm tempted to try DragonBox because I've been striking out with math apps for DS5. (DD9 doesn't really need/want them.) I note that all the other apps reviewed in that article seem to have the one of same issues I've already seen--multiple choice. (For example, the question may be “10 x 15 = ?” and the five options are “0, 1, 50, 150, 200.”) I think this is an awful way to do it for kids with number sense. Zero?? One??