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Today’s Lesson:

Today’s Lesson:. What: Multiplying and dividing integers Why: To establish the rules for multiplying and dividing integers . . MODELS FOR Multiplying INTEGERS:. Three groups of negative 3 is -9!. 3(-3) = -9. Two groups of negative 5 is -10!. 2 (____) = -10.

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Today’s Lesson:

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  1. Today’s Lesson: What: Multiplying and dividing integers Why: To establish the rules for multiplying and dividing integers.

  2. MODELS FOR Multiplying INTEGERS: Three groups of negative 3 is -9! 3(-3) = -9 Two groups of negative 5 is -10! 2(____) = -10

  3. MODEL FOR dividing INTEGERS: -6 ÷ _____ = -3 What other problem is this a model of ??? Answer: 2(-3) = -6 - - - - - -

  4. Rules for multiplying And dividing integers: SAME SIGNS DIFFERENT SIGNS _____________ ANSWER _____________ ANSWER POSITIVE NEGATIVE 3 ● 4 = 12 -3 ●-4 = 12 6÷3= 2 -6 ÷ -3 =2 -3 ● 4 = -12 3 ● -4 = -12 -6 ÷3 = -2 6 ÷ -3 = -2

  5. Multiplication/ division memory “tricks”: Fill in your letters . . . P= positive N= negative Make a Tic-Tac-Toe Board with “P’s” in the diagonal and “N’s” in all the other spaces. Read board in any direction— up, down, left, right, diagonal– from the outside in, and it will give you the right answer.

  6. Smiley Face Method: Smile = _________________ answer Frown =_________________ answer POSITIVE NEGATIVE We don’t like to be hit in the eye! We like to sleep! - + -- + - + +

  7. -48 48 -77 -30 4 -12 88.2 -168 -7

  8. END OF LESSON The next slides are student copies of the notes for this lesson. These notes were handed out in class and filled-in as the lesson progressed. NOTE: The last slide(s) in any lesson slideshow (entitled “Practice Work”) represent the homework assigned for that day.

  9. Math-7 NOTES DATE: ______/_______/_______ NAME: What: Multiplying and dividing integers Why: To establish the rules for multiplying and dividing integers. MODELS FOR Multiplying INTEGERS: Three groups of negative 3 is -9! 3(-3) = -9 2(____) = -10 Two groups of negative 5 is -10! Rules for multiplying And dividing integers: MODEL FOR DIVIDING INTEGERS: DIFFERENT SIGNS SAME SIGNS -6 ÷ _____ = -3 - - - - - - ________ ANSWER What other problem is this a model of ??? _________ ANSWER -3 ● 4 = -12 3 ● -4 = -12 3 ● 4 = 12 -3 ● -4 = 12 6÷3 = 2 -6 ÷ -3 = 2 -6 ÷3 = -2 6 ÷ -3 = -2

  10. Multiplication/ division memory “tricks”: Make a Tic-Tac-Toe Board with “P’s” in the diagonal and “N’s” in all the other spaces. Read board in any direction— up, down, left, right, diagonal– from the outside in, and it will give you the right answer. P= positive N= negative We like to sleep! We don’t like to be hit in the eye! We like to sleep! Smiley Face Method: Smile = __________ answer Frown= __________ answer - + - - + - + +

  11. NAME:__________________________ Math-7 PRACTICE DATE: ______/_______/_______ “multiply/ divide INTEGERS” Multiplication:

  12. Division:

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