Ducksters
Ducksters: Kids Math: Binary Numbers
Do you know how zeros and ones are used in this base-2 number system? Find all about binary numbers on this site. Site contains example problems.
Math Is Fun
Math Is Fun: Hexadecimal Drum Machine
Create rhythms on this 4-instrument hexadecimal drum machine and see what your rhythms look like in the binary, decimal, and hexadecimal number systems.