Silly javascript functions to sum, multiply and divide using strings, that means no limit in the size of the numbers.
test page :
It's very silly :-) Did you ever want to easily multiply
1212121212121212121212121212121212121212121212
and
2121212121212121212121212121212121212121212121
in your browser?
btw the result is
2571166207529843893480257116620752984389348025197428833792470156106519742883379247015610652