Natural & Whole Numbers Review

​The numbers we use for counting are the natural numbers: 1, 2, 3, 4, 5, and so on

​

​The set of whole numbers is the set of natural numbers plus zero: {0, 1, 2, 3,…}

​Integers Review

​The integers include all whole numbers together with the “negatives” of the natural numbers.

​Rational vs Irrational Review

The rational numbers are numbers which can be expressed as a fraction

Caution: The denominator cannot equal zero.

​Rational numbers can also appear in decimal form. If the decimal number either terminates or repeats, then it is possible to write it as a fraction with an integer numerator and denominator. Thus, it is rational as well.

​

​The irrational numbers are all numbers which when written in decimal form do not repeat and do not terminate.

​What do you notice about rational vs irrational?