Not up to date for iOS 11 – Emma's Mental Math Review

So I just purchased this app and now it tells me it's not compatible for iOS 11. My students have used this app this past year as I feel it has some beneficial qualities to help them practice some important skills. I would like to use it again, but no point in forking out money when it hasn't been updated. When are these expected updates supposed to happen? Disappointed.
Review by Taekwondomom on Emma's Mental Math.