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2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
2.2 add integers ws day1
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2.2 add integers ws day1

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  • 1.
    • Before the bell rings...
      • Have your assignment out on your desk.
      • Have your covered textbook with you.
      • 94 x 8=
      • 55.07 – 9.26=
  • 2.
    • Before the bell rings...
      • Have your assignment out on your desk.
      • Have your covered textbook with you.
      • 94 x 8=
      • 55.07 – 9.26=
    752 45.81
  • 3. Addition of Integers Section 2.2 P. 63
  • 4. Properties of Addition
    • Commutative Property : - the order in which two numbers are added does NOT change the sum. 4 + -8 = - 8 + 4
    • Associative Property : The way you group three numbers when adding does NOT change the sum.
    • (-5 + 8) + 9 = -5 + ( 8 + 9 )
  • 5. Properties of Addition
    • Additive Identity Property :
      • The sum of a number and the additive identity – ZERO- is always the number.
      • Example: 4 + 0 = 4
      • -19 + 0 = -19
      • a + 0 = a
  • 6. Properties of Addition
    • Additive Inverse Property :
    • The sum of a number and its opposite is 0. a + (- a ) = 0 -4 + 4 = 0
    • 8 + -8 = 0
  • 7. 5 + 3 = 8 Up 5 , then up 3 more If you have $5 in your pocket and are given $3 more, how much do you have? -5 + (-3) = -8 Down 5 then down 3 more If you owe $5 and then borrow $3 more, how much do you have?
  • 8.
    • Think what these two problems have in common.
    • 1. You had to add the 3 and the 5 to get the answer.
    • 2. The sign depended on the sign of the original numbers.
  • 9.
    • Rule:
    • To add numbers with the same sign,
      • ADD the numbers.
      • KEEP THE SIGN of the numbers involved.
  • 10. EXAMPLE 1 Adding Integers Using a Number Line Use a number line to find the sum. a. 5 + ( 8) – Start at 0 . Move 5 units to the right. Then move 8 units to the left.
  • 11. EXAMPLE 1 Adding Integers Using a Number Line Use a number line to find the sum. a. 5 + ( 8) – Start at 0 . Move 5 units to the right. Then move 8 units to the left. Answer The final position is –3 . So, 5 + (–8) = –3 .
  • 12. EXAMPLE 1 Adding Integers Using a Number Line Use a number line to find the sum. b. – 6 + 10 Start at 0 . Move 6 units to the right. Then move 10 units to the left.
  • 13. EXAMPLE 1 Adding Integers Using a Number Line Use a number line to find the sum. b. – 6 + 10 Start at 0 . Move 6 units to the right. Then move 10 units to the left. Answer The final position is 4 . So, –6 + 10 = 4 .
  • 14.
    • Rule:
    • To add numbers with opposite signs
      • Subtract the numbers.
      • Keep the sign of the number with the larger absolute value.
  • 15.
    • 5 + (-3) =
    • The signs are opposite so subtract.
    • 5 has the larger absolute value so the answer is positive.
    • -5 + 3 =
    • The signs are opposite so subtract.
    • 5 has the larger absolute value so the answer is negative.
  • 16.
    • Apply the rules:
    • -8 + -12 = ___ 5 + -9 = _____
    • -6 + 15 = _____ - 4 + -3 + -7 = _____
    • 7 + 5 = _____ -5 + 3 + 5 + -8 = ___
    • -7 + 7 = ____ -13 + 0 =____
  • 17.
    • Apply the rules:
    • -8 + -12 = ___ 5 + -9 = _____
    • -6 + 15 = _____ - 4 + -3 + -7 = _____
    • 7 + 5 = _____ -5 + 3 + 5 + -8 = ___
    • -7 + 7 = ____ -13 + 0 =____
    -20 -4 9 -14 12 -13 0 -5
  • 18.
    • Assignment:
    • P 65 #1-23
    • In 12-23 there are three problems that need to have either the Identity Property (adding 0) or the Inverse Property (adding opposites) listed with them.
    • Show work and NO CALCULATORS

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