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Do Now 9/29/10 Take out HW from last night. Copy HW in your planner. Textbook page 32, #24-32 all, #34-40 evens, #4858 evens Text page 36, #12-30 evens, #36-46 even Quiz on integer addition and subtraction Friday. In your journal, define the word SUBTRACT. Explain how you subtract two numbers. Homework Textbook page 32, #24-32 all, #34-40 evens, #48-58 evens 24) -14 25) -52 26) 50 27) -26 28) -15 29) -102 30) 13 31) 5 32) 21 34) 36) 38) 40) 48) 50) 52) 54) 56) 58) -71 -4 -1 a) 2; b) -3; c) -1; d) Game 1 10 -2 -18 even odd 7 Objective SWBAT subtract integers Section 1.6 “Subtracting Integers” subtracting two integers, ADD the OPPOSITE of the second number to the first. Instead of subtracting ADD When the OPPOSITE!! 8–5= Do the “OPP-OPP” 8“Opposite-Opposite” + (-5) = 3 ADD the OPPOSITE Don’t Subtract… ADD the OPPOSITE!!! -8 – 6 Instead of subtracting ADD the OPPOSITE!! What is the opposite of 6? ADD the OPPOSITE “OPP-OPP” -8 + (-6) = -14 -6 Subtraction Using a Number Line -5 -4 -3 -2 -1 0 1 2 3 4 5 -1 – (-5) = “OPP-OPP” -1 + (+5) = +5 When you ADD a POSITIVE NUMBER -1 + 5 = 4 Subtraction Using a Number Line -5 -4 -3 -2 -1 0 1 2 3 4 5 -7 2–7= “OPP-OPP” 2 + (-7) = When you ADD a NEGATIVE NUMBER 2 + (-7) = -5 Try It Out!! 1). -8 – 2 -8 + (-2) = -10 2). -2 – 5 -2 + (-5) = -7 3). 6 – (-5) 6 + (+5) = 11 4). |-4| – (-8) 4 + (+8) = 12 17 – 33 “Add the Opposite” 17 + (-33) |17| = 17 |-33| = 33 33 – 17 = - 16 Because 33 has a greater absolute value than 17 the answer is “negative”. -83 – (-25) “Add the Opposite” -83 + (+25) |-83| = 83 |25| = 25 Because 83 has a greater absolute value than 25 the answer is “negative”. 83 – 25 = - 58 53 – 85 53 + (-85) |53| = 53 “Add the Opposite” |-85| = 85 85 – 53 = - 32 Because 85 has a greater absolute value than 53 the answer is “negative”. Negative or Positive? Without solving the problem, decide whether the sum will be positive, negative, or zero. (HINT: write the problem as a sum). Add the Opposite !!! 17 – (-2) -14 – (-14) 17 + (+2) -14 + (+14) zero positive -13 – 11 -13 + (-11) negative 73 – 84 73 + (-84) negative Try It Out… -43 – 95 -43 + (-95) = -138 -43 – (-15) -43 + 15 = -28 37 – (-46) 37 + 46 = 83 -123 – 162 -123 + (-162) = -285 13 – (-13) 13 + 13 = 26 83 – 57 83 + (-57) = 26 “Integer” Cards Red cards = Negative Black cards = Positive Jack = 11, Queen = 12, King =13, Ace = 14 or 1. 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