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7th Grade Math / Lesson 7B: Basic Operations II

OPERATIONS
What will we be learning in this lesson?


  • In this lesson you will learn how the effects of operations on numbers.

    Vocabulary words are found in this purple color throughout the lesson. Remember to put these in your notebook.


Operations
Multiplying and Dividing


1. If multiplying or dividing numbers that have the same sign, the sign of the answer is positive.

  • Ex) -3 * -4 = 12 Ex) 3 * 4 = 12
  • Ex) 8 / 2 = 4 Ex) -8 / (-2) = 4

    2. If multiplying or dividing numbers that have different signs, the sign of the answer is negative.

  • Ex) -3 * 4 = -12 Ex) 3 * (-4) = -12
  • Ex) -8 / 2 = -4 Ex) 8 / (-2) = -4


  • Operations


  • Practice multiplying integers

    1. 3 * (-6) =

    2. (-4)(5) =

    3. -7(-5) =

    4. 12*3 =


  • Operations
    Multiplying


  • Practice multiplying integers

    1. 3 * (-6) = -18

    2. (-4)(5) =-20

    3. -7(-5) =35

    4. 12*3 = 36


  • Operations
    Dividing


  • Practice dividing integers

    1. 12 / 6 =
    2. (-10) / 5 =
    3. 20 / -5 =
    4. (-15) / (-3) =

  • Operations
    Dividing


  • Practice dividing integers

    1. 12 / 6         =2
    2. (-10) / 5     = -2
    3. 20 / -5        = -4
    4. (-15) / (-3)  =5