Welcome to this IRSC Adult Education Live Virtual Lesson

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Welcome to this IRSC Adult Education Live Virtual
Lesson

• Diana Lenartiene, Ed. S. moderator/instructor

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Introducing your virtual classroom
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Respond to poll
Emoticons
Chat
Adjust volume
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Multiplication and Division of Integers
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We will start with a video Which explains the
process and gives examples
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Heres a way I can Remember!

• To remember whether your answer will be positive
  or negative when MULTIPLYING or DIVIDING, well
  use

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When multiplying Integers, cover the Two signs
you are using
Choral Response
What sign is left uncovered?
Ex. 5 (-3)
Negative, - That is the sign of The answer
-15
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Practice under time!
(raffle tickets)
(-10)(3)
21 ? -5
-13 ? -6
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Division
Its not any different!
Good News
Ex. -48 ? (-4)
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Reminder

• Equal means it works both ways!

?
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Try this one!
(4)(-7) ? (-2) Hint This is a two-operation
problem.
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Grade your work

• (4)(-7) ? (-2)
• First, (4)(-7)
• - 28
• Finish it! (-28)?(-2)

Answer 14
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(-56 ? 7) ? - 2
5 ? -7 ? -6
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(-56 ? 7) ? - 2
210
5 ? -7 ? -6
- 135
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We will now view a video to review what we have
learned
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Why does it all work?
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Properties of Multiplication

• Identity a ? 1 a and 1 ? a a
• Zero Property a ? 0 0 and 0 ? a 0
• Property of -1 a(-1) -a and (-1)a -a

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Distributive Property
How will we use this with integer multiplication?

• a (bc) ab bc
• -1 (5 7) (-1)5 (-1)7

Also,
-7
(-1) 7
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Heres How to Use It

• Ex. (-7) 6
• (-1) (7 ?6) - 42

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• (-1)(-1) ?

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Why??
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Answer It is positive because both factors had
the same sign. When the signs are the same, the
answer is always positive!
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Challenge!
-8 4 2 (-1) 27 9 (-3)
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Now, you need to make a copy of this screen to
send to your teacher for proof of Attendance.
This can be done in three easy steps
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If you still have questions, please contact me
at dlenarti_at_irsc.edu

• Thank you for viewing this presentation.
• Diana Lenartiene, IRSC ABE Instructor