Big Number Talking Calculator

I recently added the use of a Big Number Talking Calculator to Sam's tool box for math.  It allows him to be more independent when completing addition and subtraction problems.  Without the talking calculator, Sam requires frequent verbal cueing from me to complete math problems.  The verbal feedback the calculator provides is clear and consistent allowing Sam to correct any entry error he has made on his own.  Also, it makes completing problems like 4+4= easier because he gets immediate verbal feedback that he has actually entered the number 4 twice.  Calculators that provide visual feedback only, do not do this, and often Sam will enter the 4 only once, thus resulting in an error in his calculations.  Sam enjoys working math problems on the talking calculator and beams with pride upon his success.  I ordered from http://www.parentgiving.com/ and the cost was $34.95 with free shipping.  While calculator math does not replace continued work teaching addition and subtraction without the use of such an aid(one does not replace the other).  This kind of funcional learning is beneficial because some day Sam may need to carry a calculator to complete his grocery shopping, etc.  Anything that helps him to function more independently at home(where support is always available)will help him to be more independent in his living when he is moving into a work and leisure environment on his own.