11.3 Multiplying & Dividing Integers

Good afternoon

Take your seat immediately in your assigned seat NOW!!!

Remain silent or detention Mrs. Imperatori lost her voice. I will do my

best to teach you this lesson. Follow all classroom rules.

State the rule for multiplying and dividing integers….

If the signs are the same,

If the signs are different,

the answer will be positive.

the answer will be negative.

1. -8 * 3 What’s The

Rule?

DifferentSigns

NegativeAnswer

-24

2. -2 * -61

SameSigns

PositiveAnswer

122

3. (-3)(6)(1)

Just

tak

eTw

o at

a t

ime

(-18)(1) -18

4. 6 ÷ (-3)

-2

5. - (20/-5) - (-4)

4

6.

408

6

68

Start inside ( ) first

7. At midnight the temperature is 8°C. If the temperature rises 4°C per hour, what is the temperature at 6 am?

How longIs it fromMidnightto 6 am?

How muchdoes the

temperaturerise each

hour?

6 hours

+4 degrees

(6 hours)(4 degrees per hour)

= 24 degrees

8° + 24° = 32°C

Add this tothe original temp.

8. A deep-sea diver must move up or down in the water in short steps in order to avoid getting a physical condition called the bends. Suppose a diver moves up to the surface in five steps of 11 feet. Represent her total movements as a product of integers, and find the product.

What

does This m

ean?

Multiply

(5 steps) (11 feet)

(55 feet)

5 * 11 = 55

Classwork and Homework Classwork: Textbook pg. 645 #1-32 ALL &

pg. 653 #1-27 ALL –DUE at 2:20pm Test –chapter 11 is on Friday 5/10 Homework: Workbook pg. 182 & 186 Cognitive Tutor: Unit 31 due 5/10 Do all units by 5/15 – no final exam!!!