This group of four sheets and their answer keys will set your students up nicely to perform simple base system conversions without calculators (for the most part). I've used these to teach computing foundations classes like AP Computer Science Principles, IT Fundamentals, Programming and Game Design, and Exploring Computer Science. Take the headache out of conversions with these simple to understand sheets. Each sheet includes examples and problems for students to work out. Bonus: I've also included the answer keys to the sheets so you can have an aide grade them! Base systems include decimal, hexadecimal, octal, and binary.