Real Numbers and the Number Line
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Transcript Real Numbers and the Number Line
Real Numbers and the Number
Line
Chapter 1 Section 3
Objective
Students will classify, graph and compare
real numbers
Students will find and estimate square roots
Square Root
A number a is a square root of a number b if
if a2 = b
Radicals
Radical Symbol √
A Radicand is the number under the radical
symbol (sometimes called square root sign)
A “radical” is just a number written in the form
of a radical symbol and a radicand.
Turn to Page 17…
Look at Problem 1
Try the “Got It” problem for that example.
Perfect Square
When the square root of a number comes
out to be a whole number then the number is
considered a perfect square.
How many perfect squares can you name?
On page 17…
Look at Problem 2…
Try the “Got It” problem for that example.
Set
A well defined collection of objects
Sets are useful to classify numbers and place
them in similar categories.
Each part of the set is called an “element”
A “subset” is a particular group of elements
of a set.
Real Number System
1.
2.
3.
4.
5.
A set of numbers including:
Rational Numbers
Natural Numbers
Whole Numbers
Integers
Irrational Numbers
Rational Number
Any number than can be written in the form
a/b where a and b are integers and b is not
equal to zero.
In decimal form, is either a terminating
decimal or a repeating decimal.
Natural Number
These are the counting numbers
{1,2,3,…}
Whole Numbers
Natural numbers and 0
{0,1,2,3,…}
Integers
Whole Numbers and their opposites
{…-3,-2,-1,0,1,2,3,…}
Irrational Numbers
Does Not fit into any of the above categories.
Cannot be written as fractions
As decimals they are non-terminating or
repeating.
Inequality
A mathematical sentence that compares the
values of two expressions using an inequality
symbol.
< means less than
> Means greater than
≤ Means less than or equal to
≥ Means greater than or equal to
On page 19…
Look at Problem 4 and 5
Try the Got It problems for these examples.
Turn to Page 20
Try problems #1-8 on your own.
Raise your hand when you are finished.