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Do Now 9/29/10

Do Now 9/29/10. Take out HW from last night. Textbook page 32, #24-32 all, #34-40 evens, #48-58 evens Copy HW in your planner. Text page 36, #12-30 evens, #36-46 even Quiz on integer addition and subtraction Friday.

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Do Now 9/29/10

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  1. Do Now 9/29/10 • Take out HW from last night. • Textbook page 32, #24-32 all, #34-40 evens, #48-58 evens • Copy HW in your planner. • 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.

  2. Homework Textbook page 32, #24-32 all, #34-40 evens, #48-58 evens • 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 • 24) -14 • 25) -52 • 26) 50 • 27) -26 • 28) -15 • 29) -102 • 30) 13 • 31) 5 • 32) 21

  3. Objective • SWBAT subtract integers

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

  5. 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” -8 + (-6) = -14

  6. SubtractionUsing a Number Line -5 -4 -3 -2 -1 0 1 2 3 4 5 -1 – (-5) = +5 When you ADD a POSITIVE NUMBER “OPP-OPP” -1 + (+5) = -1 + 5 = 4

  7. SubtractionUsing a Number Line -5 -4 -3 -2 -1 0 1 2 3 4 5 -7 When you ADD a NEGATIVE NUMBER 2 – 7 = 2 + (-7) = -5 “OPP-OPP” 2 + (-7) =

  8. Try It Out!! • 1). -8 – 2 • 2). -2 – 5 • 3). 6 – (-5) • 4). |-4| – (-8) -8 + (-2) = -10 -2 + (-5) = -7 6 + (+5) = 11 4 + (+8) = 12

  9. 17 – 33 “Add the Opposite” 17 + (-33) |17| = 17 |-33| = 33 - Because 33 has a greater absolute value than 17 the answer is “negative”. 33 – 17 = 16

  10. -83 – (-25) “Add the Opposite” -83 + (+25) |-83| = 83 |25| = 25 - 83 – 25 = 58 Because 83 has a greater absolute value than 25 the answer is “negative”. 53 – 85 “Add the Opposite” 53 + (-85) |53| = 53 |-85| = 85 - 85 – 53 = 32 Because 85 has a greater absolute value than 53 the answer is “negative”.

  11. 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 73 – 84 -13 + (-11) 73 + (-84) negative negative

  12. Try It Out… -43 – 95 -43 – (-15) -43 + (-95) -43 + 15 = -28 = -138 -123 – 162 37 – (-46) -123 + (-162) = -285 37 + 46 = 83 13 – (-13) 83 – 57 13 + 13 = 26 83 + (-57) = 26

  13. “Integer” Cards • Red cards = Negative • Blackcards = 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!

  14. Homework • Text page 36, #12-30 evens, #36-46 even

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