table pitagorico talking and talking calculator arithmetic

摘要

the multiplication tables, talking and talking calculator arithmetic "is an object similar to a electronic square shaped tablet with alphanumeric keys with observations of the braille; tavola on a face of which is achieved the image of the original multiplication tables with the addition of the number zero, on the other side is provided with a calculator arithmetic.both sides are equipped with vision and loudspeakers, which are appercepire operations during their execution.it enables learning, self education, the principles of arithmetic, even to the deaf and blind.