Math Fun funktioniert nicht

With tons of lessons and games, your child can learn how to solve arithmetic problems and master math independently.  Math Fun is a game-like math learning app that every kid loves and can easily improve their mental math ability.  It includes a proven learning methodology that is made by experts of mathematics education.  It will take your child's general arithmetic skills to the next level.  Math that is done in the mind, quickly and efficiently. - Choose from different subscription options. - Subscription payment will be charged to iTunes Account at confirmation of purchase. - Subscription automatically renews unless auto-renew is turned off at least 24-hours before the end of the current period. - Account will be charged for renewal within 24-hours prior to the end of the current period. - Subscriptions may be managed by you and auto-renewal may be turned off by going to the user's iTunes Account Settings. - Unused portion of a free-trial period will be forfeited when a user decides to subscribe.