Why does the watch / keypad have to be so small?

My daughter 8 struggles in math. She seemed interested in trying the game but has now has lost interest as the keypad is so small. It frustrates her when trying to type in an answer quickly. It is hard to be accurate when her 8 yr old finger tip is larger than the keys. Please Consider adding in an accessibility option to the app.

9designs about Operation Math for iPhone, v1.92