Voice controlled calculator

  I am tired of using the scientific calculators in my classrooms and every time I use it for large equations, it says "syntax error" or gives me wrong answers. So I have come up with the idea of controlling a calculator by our voice. Prerecorded commands installed in the calculator helps us to calculate anything by just stating equation. The digits are split according to time and we would use a software called voxox to make it happen.. I have a slide of how it is gonna work.