1 what to do… get your section 2 pre-test and checklist from my desk. if you are not done with the...

1

What To Do… Get your Section 2 pre-test and checklist from my desk.

If you are not done with the pre-test, finish it. When you get done, bring it to me so I can grade it.

Fill out your checklist using your pre-test.

Staple your pre-test to the back of your checklist.

Keep your checklist.

Get out your vocab sheet.

You do not need your calculator.

2

Pre-Algebra

Integers and Absolute Value

3

What Are You Learning? I CAN identify integers.

I CAN find the opposite of numbers.

I CAN find the absolute value of integers.

I CAN use integers to represent various situations.

4

Why Do I Need To Know This?

Using integers to represent situations is important because it allows you to use integers to symbolize real world events and situations.

5

Vocabulary Integers are whole numbers and their opposites.

Negative integers are integers less than zero.

Positive integers are integers greater than zero.

What is an example of an integer?

Where might you find integers in the real world?

6

Identify the integers in the following numbers.

8 4.5 6 1/3 -4 3

4/5 -10 3.5 ½ 1 ¾ -1

7

Write an integer for each situation. a. The average temperature in Tennessee for May was 5

degrees below normal.

b. The average rainfall in Virginia for November was 5 inches above normal.

c. 6°F below 0

d. A loss of 11 yards

e. A deposit of $16

f. The price of a company’s stock fell 21 points in two days. Write an integer to represent the amount the stock price fell.

8

Write an integer that represents 8° below 0.

-8 8

25% 25%25%25%

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

1. -82. 83. │-8│

4. │8│

9

Write an integer that represents a loss of $20

-20 20

25% 25%25%25%

1. │-20│

2. -203. │20│

4. 20

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

10

Write an integer for each situation.

a. The temperature of the liquid is 4 degrees below zero.

b. Seawater freezes 2 degrees below zero.

c. 12 degrees above Celsius.

d. A debt of $5.

e. 23 feet above the surface.

11

Vocabulary

Absolute Value—the distance the number is from zero on a number line.

12

Find the absolute value.

a. |-3|b. |3|c. |-10|d. |-5|e. |5|f. |-12|

13

Evaluate │-7│

7 14 -7

25% 25%25%25%

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

1. 72. -│-7│

3. 144. -7

14

Evaluate │5 │+ │-2 │

-7 -3 3 7

25% 25%25%25%

1. -72. -33. 34. 7

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

15

Evaluate │7 │ + │-3 │

10 4 -4 -10

25% 25%25%25%

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

1. 102. 43. -44. -10

16

Evaluate │3│ - │-2│

-1 -5 5 1

25% 25%25%25%

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

21 22 23 24 25 26 27 28 29 30

1. -12. -53. 54. 1

17

Find the absolute value

a. |6|b. |-6| c. |-4|d. |-5|e. |-5| - |2|f. |-4| - |-3|

18

Determine whether each statement is true or false. If false, give a counterexample.

a. Every integer has an absolute value.

b. The absolute value of every integer is positive.

19

Complete each sentence with a word that makes it true.

a. An integer is negative, positive, or ____.

b. All _____ integers are less than zero.

c. The opposite of a _______ number is negative.

d. The absolute value of an integer is never ________.