Do Now 9/17/09  Take out HW from last night. Textbook page 32 #14-40 even, #48-58 even Textbook page 32 #14-40 even, #48-58 even  Copy HW in your planner.

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It’s All in the Cards Adding and Subtracting Integers

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Do Now 9/17/09  Take out HW from last night. Textbook page 32 #14-40 even, #48-58 even Textbook page 32 #14-40 even, #48-58 even  Copy HW in your planner. Text page 36, #12-30 evens, #36-46 even Text page 36, #12-30 evens, #36-46 even Quiz on integer addition and subtraction Monday. Quiz on integer addition and subtraction Monday.  In your journal, define the word SUBTRACT. Explain how you subtract two numbers.

Homework Textbook page 32 #14-40 even, #48-58 even  14) A  16) 9  18) 10  20) -13  22) 3  24) -14  26) 50  28) -15  30) 13  32) 21  34) -71  36) -4  38) -1  40) a) 2; b) -3; c) -1; d) Game 1  48) 10  50) -2  52) -18  54) even  56) odd  58) 7

Objective  SWBAT subtract integers

Section 1.6 “Subtracting Integers”  When subtracting two integers, ADD the OPPOSITE of the second number to the first. 8 – 5 = Instead of subtracting ADD the OPPOSITE!! What is the opposite of 5? 8 + (-5) = - 5 ADD the OPPOSITE 3 Do the “OPP-OPP” “Opposite-Opposite”

Don’t Subtract… ADD the OPPOSITE!!! -8 – 6 Instead of subtracting ADD the OPPOSITE!! What is the opposite of 6? (-6) = ADD the OPPOSITE “OPP-OPP” -14

Subtraction Using a Number Line When you ADD a POSITIVE NUMBER -1 – (-5) = = (+5) = “OPP-OPP”

Subtraction Using a Number Line When you ADD a NEGATIVE NUMBER 2 – 7 = (-7) = (-7) = “OPP-OPP”

Try It Out!!  1). -8 – 2  2). -2 – 5  3). 6 – (-5)  4). |-4| – (-8) -8 + (-2) = (+5) = (-5) = (+8) = 12

17 – (-33) |17| = 17 |-33| = – 17 = 16 - Because 33 has a greater absolute value than 17 the answer is “negative”. “Add the Opposite”

|-83| = (+25) |25| = – 25 = 58 - Because 83 has a greater absolute value than 25 the answer is “negative”. |53| = (-85) |-85| = – 53 = 32 Because 85 has a greater absolute value than 53 the answer is “negative”. -83 – (-25) “Add the Opposite” 53 – 85 “Add the Opposite” -

Negative or Positive?  Without solving the problem, decide whether the sum will be positive, negative, or zero. (HINT: write the problem as a sum). 17 – (-2) positive -13 – 11 negative -14 – (-14) zero 73 – 84 negative 17 + (+2) (-11) (+14) 73 + (-84) Add the Opposite !!!

Try It Out… -43 – 95 = – (-15) = -28 = – (-46) = – 162 = – (-13) = – 57 = 26

“Integer” Cards  Red cards = Negative  Black cards = Positive  Jack = 11, Queen = 12, King =13  Dealer deals each player 2 cards.  The player with the highest difference, gets all the cards from that round.  The player with the most cards at the end of the deck wins!

Homework  Text page 36, #12-30 evens, #36-46 even