This is a two page word document about number systems and operations using real numbers. It can be used as guided notes or as an aid in reviewing for the OGT (Ohio Graduation Test) or ACT. The first half reviews the different types of number systems such as: real, imaginary, rational, irrational, integers, whole numbers, and natural numbers. There are practice problems to name the type of number and also to compare and order them. The second half reviews absolute value and uses it to find the distance between two points on a number line.