Integer Operations: Addition, Subtraction, Multiplication, and Division.

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Presentation transcript:

Integer Operations: Addition, Subtraction, Multiplication, and Division

OBJECTIVE: To perform operations with integers. DO NOW: 1.Take out HW & Leave on desk. 2.Pick up “Enrichment 1-1: A Variable Maze” handout on side table and work through the FRONT only.

Agenda 1.Complete Do Now 2.Check HW. Any Questions? 3.Quick Notes & Examples 4.Integer Pre-Assessment 5.Split into 2 class groups 6.Integer Bingo

Integer Addition and Subtraction Spread out Sit every other desk.

Integer Addition Think in terms of money! Positive Numbers: $ you have Negative Numbers: $ you owe

Ex #1 5+3 Think… You have $5 and you have $3. How much money do you have? = 8

Ex #2 -5+(-3) Think… You owe $5 and you owe $3. How much money do you have? = -8

Ex # Think… You owe $5 and you have $3. How much money do you have? = -2

Ex #4 5+(-3) Think… You have $5 and you owe $3. How much money do you have? = 2

Ex # Think… You owe $5 and you have $5. How much money do you have? = 0

Integer Multiplication & Division Rules for Multiplying & Dividing Integers: 1. ODD amount of negatives: NEGATIVE 2. EVEN amount of negatives: POSITIVE Then, multiply or divide the numbers normally!

Ex #1 5∙3 Think… You have 0 (even) amount of negative numbers. What sign will the answer be? What value will the answer be? = 15

Ex #2 -8∙9 Think… You have 1 (odd) amount of negative numbers. What sign will the answer be? What value will the answer be? = -72

Ex #3 -4∙-9 Think… You have 2 (even) amount of negative numbers. What sign will the answer be? What value will the answer be? = 36

Ex #4 8∙-3 Think… You have 1 (odd) amount of negative numbers. What sign will the answer be? What value will the answer be? = -24

Ex #5 5∙ -2∙ -3 Think… You have 2 (even) amount of negative numbers. What sign will the answer be? What value will the answer be? = 30

Ex #6 5∙ -2∙ 0 NOTICE… 0 is one of your factors. What will your product be? Remember… 0 multiplied by anything is 0! 0 is not positive or negative! = 0

Ex #7 -5∙ -2∙ -3 Think… You have 3 (odd) amount of negative numbers. What sign will the answer be? What value will the answer be? = -30

Ex #8 = -2

Ex #9 = 3

Ex #10 = -4

Ex #11 = 0

Ex #12 = undefined

SPECIAL NOTE…

Split into two groups… 1)Independent Practice “Why did the boy wear glasses in math class?” (front) 2)Whiteboards with Ms. Hornick (turn desks around & in back)

Return to your original seats!

Integer Bingo Call BINGO if you get… 5 in a row or 4 corners or Board’s perimeter

Find the mistake…