Voice activated calculator that allowed me to rapid fire simple math from across the room. If it did math while people were meeting and conversing and spat out

Voice activated calculator that allowed me to rapid fire simple math from across the room. If it did math while people were meeting and conversing and spat out an answer, that would be pretty cool. I also like counting apps: take a picture of a bowl of Cheerios and it counts the 'O's, or the number of pipes in a rack at a hardware store. I'm sure they've been engineered already or at least thought of before, but so far voice calculators seem slow and clunky like voice assistants, and counting apps lack surety and I wouldn't bet anyone's job on them that I've found so far.