REAL NUMBERS Two Kinds of Real Numbers Rational

REAL NUMBERS

Two Kinds of Real Numbers • Rational Numbers • Irrational Numbers

Rational Numbers A rational number… • is a real number that can be written as a (fraction). • written in decimal form is terminating (ends) or repeating.

Examples of Rational Numbers • 16 • 1/2 • 3. 56 • -8 • 1. 3333… • - 3/4 Can you write 16 as a ratio? Now try writing -8 as a ratio!

Irrational Numbers • An irrational number • is a number that cannot be written as a fraction. • written as decimals are nonterminating (never end!) and nonrepeating (no pattern).

Examples of Irrational Numbers • Square roots of non-perfect “squares” • Pi 17 What is the square root of 17? What is another non-perfect square?

Integers One of the subsets of rational numbers

What are integers? • Integers are the whole numbers and their opposites. • Examples of integers are 6 -12 0 186 -934 What do you notice about these integers?

Whole Numbers One of the subsets of rational numbers and integers ?

Whole Numbers • All positive numbers that are counting numbers plus zero. • How can you remember that zero goes with whole numbers? • Examples: 0, 1, 2, 3, 4, 5 …

Natural Numbers One of the subsets of rational numbers, integers and whole numbers

Natural Numbers • All of your counting numbers • What numbers do you count with?

Classify the following Numbers • What subset(s) do the following numbers belong to? Remember they could belong to more than one! • 0 • Whole, Integers, Rational, and Real

Classify the following Numbers (Con’t) • 4 • Natural, Whole, Integer, Rational, Real • -9 • Integer, Rational, Real • Π • Irrational, Real

Classify the following Numbers (Con’t) • 3/4 or 0. 75 • Rational and Real • 4 • 15 • Natural, Whole, Integer, Rational, Real • Irrational, Real