Use a number line to identify if you need to round up or round down. The whole numbers are equally spaced on this number line. The values increase by each step to the right.

Together, rational and irrational numbers make up the real numbers, which include any number on the number line and which lack the imaginary number i. The majority of real numbers are irrational.

Explains the concept of zero in mathematics, emphasizing its role as a number that represents the empty set. It illustrates how zero is used in addition and subtraction, showing that adding or ...