A talking calculator has a built-in speech
synthesizer that reads aloud each number,
symbol, or operation key a user presses;
it also vocalizes the answer to the problem.
There are several high contrast calculator
apps and extensions that are available for
both IOS, Android, and Google Chrome.
They are similar to traditional calculators in that a speech synthesizer identifies a key selected and also the answer. The Talking Calculator App for IOS can be a solution for a wide variety of ages. The MyScript Calculator recognizes handwriting and provides calculations.