The Number Line

On the Math 1 test, one or two questions will involve i, the imaginary unit, which you will read about later in Section 2-P. Otherwise, the word number always means real number, a number that can be represented by a point on the number line.

Number line ranging from -4 to +4. It points out different forms of numbers including -3 1/3 between -4 and -4, -1/2 between 0 and -1, 0.5 between 0 and 1, radical 2 between 1 and 2, 2.54 between 2 and 3, and pi between 3 and 4.

A positive number is a number that lies to the right of 0 on the number line. A negative number lies to the left of 0 on the number line.