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Lesson 4.5 Multiplying Integers

Objective: Students will be able to multiply positive and negative integers. Lesson 4.5 Multiplying Integers. -2(4)=-8. -3(-4)=12. 1(-4)=-4. -3(4)=-12. -1(4)=-4. -2(-4)=8. 2(-4)=-8. 3(4)=12. Review:. Adding Integers. 6 + (-7) = -3 + 8 =. -1. 5 + 8 = -11 + -3 =. 13. 5. -14.

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Lesson 4.5 Multiplying Integers

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  1. Objective: Students will be able to multiply positive and negative integers. Lesson 4.5 Multiplying Integers -2(4)=-8 -3(-4)=12 1(-4)=-4 -3(4)=-12 -1(4)=-4 -2(-4)=8 2(-4)=-8 3(4)=12

  2. Review: Adding Integers 6 + (-7) = -3 + 8 = -1 5 + 8 = -11 + -3 = 13 5 -14 When signs are the same ______ their absolute values, and use the sign in the sum. When signs are different _________ their absolute values, and use the sign of the integer with the greatest absolute value SUBTRACT ADD

  3. Review: Subtracting Integers Follow the addition rules 2 – 4 = -5 – 3= -3 – (-6) = -2 -8 3 When signs are the same ______ their absolute values, and use the sign in the sum. When signs are different _________ their absolute values, and use the sign of the integer with the greatest absolute value ADD THE OPPOSITE ADD SUBTRACT ADD: Change the subtraction sign to an addition sign THE OPPOSITE: Change the integer to the right of the subtraction sign to its opposite

  4. Multiplying Integers Let’s see if you can figure the rules out! 3(7) = 21 -3(-7)= 21 -3(7)= -21 3(-7)= -21 P x p = p The product of two positive integers is positive. The product of two negative integers is positive. N X N = P N X P = N The product of two integers with different signs is negative. P X N = N Important note: Does the absolute value of integers effect the sign of the products? _______ NO!

  5. Okay, now it’s your turn 4(7) = (-2)(-4) = 5(-5) = (-8)(9) = 9m when m= -4 Challenge: (-1)(-2)(-3) = (-1)(-2)(-3)(-1) = 28 8 -25 -72 9(-4) = -36 NOTE: An odd number of negative factors produces a negative product. -6 6 NOTE: An even number of negative factors produces a positive product.

  6. It’s Homework time! Practice 4.5 ALL! Multiplying Integers Tree Map Will be due Friday

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