Such a great idea! From instructables user kanim:

The motto of the project is to make the visually challenged to perform mathematical calculations. A Gesture based module interprets mathematical data and operators from the finger movement.It facilitates the visually challenged/impaired to perform arithmetic calculations(Addition,Subtraction,Multiplication,Division). Gestures, Specifically finger movements are used to input values with which the required mathematical calculations can be performed.

Gesture controls are enabled by interfacing the flex sensor embedded gloves with a Intel Edison. Flex Sensors are placed in a voltage divider circuit with a potentiometer .Based on the multiple resistance values obtained on bending the flex sensor, the user’s input the specific value. these values are processed in the intel edison. The output of the calculation can be heard through the bluetooth speaker. and also displayed via lcd display.

Full instructable