i know this isn't a problem more like a suggestion with the buttons you push "tens" "ones" "tenths" etc.
maybe you should make it so if you push the second button down it will highlight the first and second buttons Ex. 305.53 is the number you push the third button down from the top under "hundreds" you have the first second and third button press already instead of pressing three "hundreds" buttons no "tens" buttons are pushed and with "ones" the fifth button down is pushed instead of pressing 5 different "ones" buttons are pushed "tenths" the fifth button down is pushed instead of pressing 5 different "tenths" buttons
with "hundreds" the third button down is pushed instead of pressing pressing three "hundreds" buttons.
hope this helps your website out
Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.7 (KHTML, like Gecko) Chrome/16.0.912.63 Safari/535.7
MathJax is loaded, ready, queue length: 0