You are downloading the Amusing Arithmetic XAP file v18.104.22.168 for Windows Phone. Amusing Arithmetic is a free and fun Educational game: You need to solve simple math examples and to write the answer using the numeric buttons. To delete a digit, click the backspace button "<". ... You can now download the offline XAP file to install & try it.
Download Locations for Amusing Arithmetic 22.214.171.124 XAP file
Note: To install it manually from an SD card, you should choose one of the server location above to get the offline Amusing Arithmetic XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.