Unit One

Starts with chapter twoPages 54-58a

(Then backs up to page 21)

WARM UP

• Evaluate the following expressions when x = 2 and x = 3 (two answers for each).

• 3x – 1

• 4(x+3)

WARM UP answers

• 3x – 1 =3(2) – 1=53(3)-1 = 8

• 4(x+3)4(2+3) =204(3+3)=24

Rational Numbers

TerminateRepeat

Let’s look at Terminating decimals

• The fraction

• Doing the math

• 0.8 comes to an end, or terminates

44 5

5= ﾸ

4 5 0.8=ﾸ

Try one.

Does terminate?

0.625 does not continue past the five (5). It terminates.

5

8

5 8 0.635=ﾸ

Repeating Decimals

• Try dividing

• We read this as point 3 repeating.

1

310.3333333333...

3=

0.3

Try One

• Is a repeating decimal?

• 5/12 is a repeating decimal

5

125

0.41666666...12

=

0.4166666... 0.416=

Which is it?

• Is a repeating or a terminating decimal?

• A: repeating decimal

7

9

70.7

9=

Greater than or Less than?

It’s time to know that > is greater than.

< means less than.

is equal to or less than.

is equal to or less than.

ﾣﾳ

Order these numbers

1 -7

-14.8 -14.6

532,028 523,828

Order numbers answers

3 > -7

-14.8 < -14.6

532,028 > 523,828

Opposite numbers

-3 is the opposite of +3-15 is the opposite of +15+7.5 is the opposite of -7.5

What do you get when you add two opposites numbers?

-9 + 9 = 0

Absolute Value

The answer to numbers inside absolute value signs is always positive.

What does Absolute Value Not mean?Absolute value is NOT opposite.

Try some.

| -5 + 7 | =

| -6 + -15 | =

3 - |-4 + -5| =

• +2

• +21

• -6 ( order of operations is used)3 – (+9)

Go Tigers