Do Now 9/28/10 Take out your HW from last night. Take out your HW from last night. Textbook page 31-32, #3-11, all Textbook page 31-32, #3-11, all Copy HW in your planner. Copy HW in your planner. Textbook page 32, #24-32 all, #34-40 evens, #48-58 evens Textbook page 32, #24-32 all, #34-40 evens, #48-58 evens Quiz on adding and subtracting integers Friday. Quiz on adding and subtracting integers Friday. In your journal, answer the following question. How do you add two integers that have the same sign? How do you add two integers that have different signs? Provide an example for each question. In your journal, answer the following question. How do you add two integers that have the same sign? How do you add two integers that have different signs? Provide an example for each question.

Homework Textbook page 31-32, #3-11, all 3) 2 3) 2 4) -15 4) -15 5) 8 5) 8 6) 8 6) 8 7) -12 7) -12 8) -13 8) -13 9) -6 9) -6 10) ) ) ) ) The arrow should start at -2 and go 5 units in the positive direction; = 3 13) The arrow should start at -2 and go 5 units in the positive direction; = 3 14) A 14) A 15) ) ) 9 16) 9 17) ) ) 10 18) 10 19) ) ) ) ) 6 21) 6 22) 3 22) 3 23) -9 23) -9

Objective SWBAT use absolute values to perform integer addition SWBAT use absolute values to perform integer addition

Section 1.5 “Adding Integers” Part When you ADD a POSITIVE NUMBER POSITIVE NUMBER x + 5 = = 1 x = =

Addition Using a Number Line When you ADD a NEGATIVE NUMBER NEGATIVE NUMBER 5 + (-7) = (-7) = x = x = -7

ABSOLUTE VALUE The distance a number is away from ZERO. Distance is always positive. The distance a number is away from ZERO. Distance is always positive negative positivezero What is the absolute value of -4? or |-4| |-4| = 4 What is the absolute value of 4? or |4|? |4| = 4 Remember this???

|35| = Adding Two Integers with SAME signs To add two integers with the SAME signs, add the absolute values of the numbers. The answer will have the same sign. To add two integers with the SAME signs, add the absolute values of the numbers. The answer will have the same sign. |18| = = 53 = 53 Section 1.5 “Adding Integers” Part 2 |-35| = (-18) |-18| = = 53 -

|-35| = Adding Two Integers with DIFFERENT signs To add two integers with DIFFERENT signs, subtract the smaller absolute value from the greater absolute value and write the sign of the integer with the greater absolute value. To add two integers with DIFFERENT signs, subtract the smaller absolute value from the greater absolute value and write the sign of the integer with the greater absolute value. |18| = – 18 = 17 - Because 35 has a greater absolute value than 18 the answer is “negative”. Section 1.5 “Adding Integers” Part 2

|-43| = |35| = – 35 = 8 - Because 43 has a greater absolute value than 35 the answer is “negative”. |-53| = |85| = – 53 = 32 Because 85 has a greater absolute value than 53 the answer is “positive”.

Negative or Positive? Without solving the problem, decide whether the sum will be positive, negative, or zero. Without solving the problem, decide whether the sum will be positive, negative, or zero. 7 + (-4) positive negative zero (-67) negative

Try It Out… = (-15) = -58 = (-46) = = = = -26

“Integer” Cards Red cards = Negative Red cards = Negative Black cards = Positive Black cards = Positive Jack = 11, Queen = 12, King =13, Ace = 1 or 14 Jack = 11, Queen = 12, King =13, Ace = 1 or 14 Dealer deals each player 2 cards. Dealer deals each player 2 cards. The player with the highest sum, gets all the cards from that round. The player with the highest sum, gets all the cards from that round. The player with the most cards at the end of the deck wins! The player with the most cards at the end of the deck wins!

Homework Textbook page 32 #14-40 even, #48-58 even Textbook page 32 #14-40 even, #48-58 even